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chore: initial commit

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Signed-off-by: Matej Focko <mfocko@redhat.com>
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Matej Focko 2021-12-28 16:12:22 +01:00
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127
3kyu/battleship_field_validator/solution.cs Normal file
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namespace Solution {
using System;
using System.Collections.Generic;
public class BattleshipField {
private enum Direction {
HORIZONTAL,
VERTICAL
}
private class Ship {
private int y, x;
private Direction d;
private int size;
public int Size {get => size;}
public Ship(int y, int x, Direction d, int size) {
this.y = y;
this.x = x;
this.d = d;
this.size = size;
}
public bool IsTouching(Ship b) {
if (d == Direction.HORIZONTAL) {
if ((b.y >= this.y - 1 && b.y <= this.y + 1) &&
(b.x >= this.x - 1 && b.x <= this.x + this.size))
return true;
else return false;
}
if (d == Direction.VERTICAL) {
if ((b.x >= this.x - 1 && b.x <= this.x + 1) &&
(b.y >= this.y - 1 && b.y <= this.y + this.size))
return true;
else return false;
}
return false;
}
public override string ToString() {
string direction = this.d == Direction.HORIZONTAL ? "horizontal" : "vertical";
return $"x: {this.x}\ty: {this.y}\tdir: {direction}\tsize: {this.size}";
}
}
private List<Ship> ships;
private int battleships = 1,
cruisers = 2,
destroyers = 3,
submarines = 4;
public BattleshipField() {
this.ships = new List<Ship>();
}
private void registerShip(int y, int x, Direction d, int count) {
this.ships.Add(new Ship(y, x, d, count));
switch (count) {
case 1:
this.submarines--;
break;
case 2:
this.destroyers--;
break;
case 3:
this.cruisers--;
break;
case 4:
this.battleships--;
break;
}
}
private bool areTouching() {
for (var i = 0; i < this.ships.Count - 1; i++)
for (var j = i + 1; j < this.ships.Count; j++)
if (this.ships[i].IsTouching(this.ships[j])) return true;
return false;
}
public bool IsValidField() {
if (this.submarines != 0 || this.destroyers != 0 ||
this.cruisers != 0 || this.battleships != 0)
return false;
else if (this.areTouching())
return false;
return true;
}
public static bool ValidateBattlefield(int[,] field) {
// Write your magic here
var validator = new BattleshipField();
int count = 0;
for (int y = 0, rows = field.GetLength(0); y < rows; y++) {
for (int x = 0, cols = field.GetLength(0); x < cols; x++) {
if (field[y, x] == 1) {
// check for vertical ship
if (count == 0) {
if (y < rows - 1 && field[y + 1, x] == 1) {
for (int dy = 0; y + dy < rows; dy++) {
if (field[y + dy, x] == 1) {
field[y + dy, x] = 0;
count++;
} else break;
}
if (count > 1) {
validator.registerShip(y, x, Direction.VERTICAL, count);
count = 0;
continue;
}
}
}
field[y, x] = 0;
count++;
} else if (field[y, x] == 0 && count > 0) {
validator.registerShip(y, x - count, Direction.HORIZONTAL, count);
count = 0;
}
}
}
return validator.IsValidField();
}
}
}

103
3kyu/binomial_expansion/solution.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
public class KataSolution {
public static IEnumerable<long> Combinations(long n) {
if (n < 0) {
Console.WriteLine("Error happened");
throw new ArgumentException("n cannot be negative");
}
for (
long k = 0, nCk = 1;
k <= n;
nCk = nCk * (n - k) / (k + 1), k++
) {
yield return nCk;
}
}
public static IEnumerable<long> Range(long count) {
for (var i = 0; i < count; i++) {
yield return i;
}
}
public static IEnumerable<long> Expand(int a, int b, int n) {
long aExpd = (long) Math.Pow(a, n);
long bExpd = 1;
foreach (var nCk in Combinations(n)) {
yield return nCk * aExpd * bExpd;
aExpd /= a;
bExpd *= b;
}
}
public static (int, int, string) ParseInner(string expr) {
var innerPart = expr.Split('^')[0];
innerPart = innerPart.Substring(1, innerPart.Length - 2);
var coeffA = new String(
innerPart.TakeWhile(c => !char.IsLetter(c)).ToArray()
);
var variable = new String(
innerPart.SkipWhile(c => !char.IsLetter(c)).TakeWhile(char.IsLetter).ToArray()
);
var coeffB = new String(
innerPart.SkipWhile(c => !char.IsLetter(c)).SkipWhile(char.IsLetter).ToArray()
);
var parsedCoeffA = coeffA switch {
"" => 1,
"-" => -1,
_ => int.Parse(coeffA)
};
return (parsedCoeffA, int.Parse(coeffB), variable);
}
public static int ParseExponent(string expr) {
var splitExpr = expr.Split('^');
return int.Parse(splitExpr[1]);
}
public static string FormatTerm(long coefficient, string variable, long exponent) {
var prefix = (coefficient > 0) ? "+" : "";
if (coefficient == 0) {
return "";
}
if ((coefficient == 1 || coefficient == -1) && exponent == 0) {
return $"{prefix}{coefficient}";
}
var coeff = coefficient switch {
0 => "",
1 => prefix,
-1 => "-",
_ => $"{prefix}{coefficient}"
};
var varExp = exponent switch {
0 => "",
1 => variable,
_ => $"{variable}^{exponent}"
};
return $"{coeff}{varExp}";
}
public static string Expand(string expr) {
var n = ParseExponent(expr);
var (a, b, variable) = ParseInner(expr);
var result = "";
foreach (var (exponent, coefficient) in Range(n + 1).Reverse().Zip(Expand(a, b, n))) {
result += FormatTerm(coefficient, variable, exponent);
}
return result.TrimStart(new char[] {'+'});
}
}

88
3kyu/screen_locking_patterns/solution.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
public static class Kata {
private class Graph {
private struct Edge {
public char Through { get; set; }
public char To { get; set; }
};
public static readonly char NO_CONDITION = '\0';
private Dictionary<char, List<Edge>> edges = new Dictionary<char, List<Edge>>();
private HashSet<char> visited = new HashSet<char>();
private Graph addEdge(char src, char through, char dst) {
var newEdge = new Edge {
Through = through,
To = dst
};
if (edges.TryGetValue(src, out var lst)) {
lst.Add(newEdge);
} else {
edges.Add(src, new List<Edge>() { newEdge });
}
return this;
}
public Graph AddDirectEdge(char src, char dst)
=> addEdge(src, NO_CONDITION, dst);
public Graph AddIndirectEdge(char src, char through, char dst)
=> addEdge(src, through, dst);
public Graph AddBiDirectEdge(char src, char dst)
=> AddBiIndirectEdge(src, NO_CONDITION, dst);
public Graph AddBiIndirectEdge(char src, char through, char dst) =>
addEdge(src, through, dst)
.addEdge(dst, through, src);
public void ResetVisited() => visited.Clear();
public bool BeenVisited(char vertex) => visited.Contains(vertex);
public void Mark(char vertex) => visited.Add(vertex);
public void Unmark(char vertex) => visited.Remove(vertex);
public bool HasEdge(char fromVertex, char toVertex)
=> edges[fromVertex].Any(e => e.To == toVertex && (e.Through == NO_CONDITION || BeenVisited(e.Through)));
public Graph AddMultipleBiDirectEdges(char fromVertex, string toVertices) {
foreach (var toVertex in toVertices) {
AddBiDirectEdge(fromVertex, toVertex);
}
return this;
}
}
private static Graph g = new Graph()
.AddMultipleBiDirectEdges('A', "BDEFH").AddMultipleBiDirectEdges('B', "CDEFGI")
.AddMultipleBiDirectEdges('C', "DEFH").AddMultipleBiDirectEdges('D', "EGHI")
.AddMultipleBiDirectEdges('E', "FGHI").AddMultipleBiDirectEdges('F', "GHI")
.AddMultipleBiDirectEdges('G', "H").AddMultipleBiDirectEdges('H', "I")
.AddBiIndirectEdge('A', 'B', 'C').AddBiIndirectEdge('A', 'D', 'G').AddBiIndirectEdge('A', 'E', 'I')
.AddBiIndirectEdge('B', 'E', 'H').AddBiIndirectEdge('C', 'E', 'G').AddBiIndirectEdge('C', 'F', 'I')
.AddBiIndirectEdge('D', 'E', 'F').AddBiIndirectEdge('G', 'H', 'I');
public static int CountPatternsFrom(char firstDot, int length) {
if (length <= 0 || length >= 10) {
return 0;
}
if (length == 1) {
return 1;
}
int total = 0;
g.Mark(firstDot);
foreach (var vertex in "ABCDEFGHI") {
if (!g.BeenVisited(vertex) && g.HasEdge(firstDot, vertex)) {
total += CountPatternsFrom(vertex, length - 1);
}
}
g.Unmark(firstDot);
return total;
}
}

181
4kyu/4_by_4_skyscrapers/solution.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
public class Skyscrapers {
private static IEnumerable<List<T>> Permutations<T>(List<T> initial)
where T: IComparable<T> {
yield return initial;
var hasNext = initial.Count > 1;
while (hasNext) {
var k = 0;
var l = 0;
hasNext = false;
for (var i = initial.Count - 1; i > 0; i--) {
if (initial[i].CompareTo(initial[i - 1]) > 0) {
k = i - 1;
hasNext = true;
break;
}
}
for (var i = initial.Count - 1; i > k; i--) {
if (initial[i].CompareTo(initial[k]) > 0) {
l = i;
break;
}
}
(initial[k], initial[l]) = (initial[l], initial[k]);
initial.Reverse(k + 1, initial.Count - k - 1);
if (hasNext) {
yield return initial;
}
}
}
private static bool IsValid(List<int> heights, int clue) {
var canSee = 1;
var lastHeight = heights[0];
for (var i = 1; i < heights.Count; i++) {
var currentHeight = heights[i];
if (currentHeight > lastHeight) {
lastHeight = currentHeight;
canSee++;
}
}
return canSee == clue;
}
private static IEnumerable<List<int>> PossibleHeights(int size, int clue) {
var initial = new List<int>();
for (var i = 0; i < size; i++) {
initial.Add(i + 1);
}
if (clue == 0) {
return Permutations(initial);
}
return Permutations(initial).Where(heights => IsValid(heights, clue));
}
private static int Size {
get => 4;
}
private static (int, int) GetDiffs(int clueIndex) {
if (clueIndex < Size) {
return (0, 1);
} else if (clueIndex < 2 * Size) {
return (-1, 0);
} else if (clueIndex < 3 * Size) {
return (0, -1);
}
return (1, 0);
}
private static (int, int) GetStarts(int clueIndex) {
if (clueIndex < Size) {
return (clueIndex, 0);
} else if (clueIndex < 2 * Size) {
return (Size - 1, clueIndex % Size);
} else if (clueIndex < 3 * Size) {
return (Size - 1 - clueIndex % Size, Size - 1);
}
return (0, Size - 1 - clueIndex % Size);
}
private static List<int> BackupHeights(int[][] heights, int clueIndex) {
var backup = new List<int>();
var (dx, dy) = GetDiffs(clueIndex);
for (
var (x, y) = GetStarts(clueIndex);
x >= 0 && x < Size && y >= 0 && y < Size;
x += dx, y += dy
) {
backup.Add(heights[y][x]);
}
return backup;
}
private static bool EmplaceHeights(
int[][] heights, int clueIndex, List<int> newHeights, bool force
) {
int i = 0;
var (dx, dy) = GetDiffs(clueIndex);
for (
var (x, y) = GetStarts(clueIndex);
x >= 0 && x < Size && y >= 0 && y < Size;
x += dx, y += dy
) {
if (
!force && heights[y][x] != 0 && heights[y][x] != newHeights[i]
) {
return false;
}
heights[y][x] = newHeights[i++];
}
return true;
}
private static bool SolvePuzzle(
int[][] heights, int[] clues, int clueIndex, bool ignoreZeroes
) {
while (clueIndex < 4 * Size && (
(ignoreZeroes && clues[clueIndex] == 0) || (!ignoreZeroes && clues[clueIndex] != 0)
)) {
clueIndex++;
}
if (clueIndex >= 4 * Size) {
return true;
}
// create copy of heights to ensure correct resetting
var currentHeights = BackupHeights(heights, clueIndex);
// iterate through the options
foreach (var possibleHeights in PossibleHeights(Size, clues[clueIndex])) {
// emplace heights and if conflict occurs, reset and try next one
if (!EmplaceHeights(heights, clueIndex, possibleHeights, false)) {
EmplaceHeights(heights, clueIndex, currentHeights, true);
continue;
}
// if no conflict present, try filling out other clues
if (SolvePuzzle(heights, clues, clueIndex + 1, ignoreZeroes)) {
return true;
}
// otherwise reset heights and try again
EmplaceHeights(heights, clueIndex, currentHeights, true);
}
// if we got here, there is no feasible configuration of buildings
return false;
}
public static int[][] SolvePuzzle(int[] clues) {
var result = new int[Size][];
for (var i = 0; i < Size; i++) {
result[i] = new int[Size];
}
SolvePuzzle(result, clues, 0, true);
// in case there are left zeroes
SolvePuzzle(result, clues, 0, false);
return result;
}
}

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4kyu/4_by_4_skyscrapers/solution.java Normal file
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import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
public class SkyScrapers {
private static class Permutations<T extends Comparable<T>> implements Iterable<List<T>> {
public class PermutationsIterator implements Iterator<List<T>> {
private List<T> elements;
private boolean _hasNext;
private boolean firstIteration = true;
public PermutationsIterator(List<T> elements) {
this.elements = elements;
_hasNext = elements.size() > 0;
}
private void swap(int k, int l) {
T tmp = elements.get(k);
elements.set(k, elements.get(l));
elements.set(l, tmp);
}
public boolean hasNext() {
return _hasNext;
}
public List<T> next() {
if (!_hasNext) {
throw new NoSuchElementException("No more permutations are left");
}
var lastIteration = new ArrayList<T>(elements);
int k = 0, l = 0;
_hasNext = false;
for (int i = elements.size() - 1; i > 0; i--) {
if (elements.get(i).compareTo(elements.get(i - 1)) > 0) {
k = i - 1;
_hasNext = true;
break;
}
}
for (int i = elements.size() - 1; i > k; i--) {
if (elements.get(i).compareTo(elements.get(k)) > 0) {
l = i;
break;
}
}
swap(k, l);
Collections.reverse(elements.subList(k + 1, elements.size()));
return lastIteration;
}
}
private List<T> elements;
public Permutations(List<T> elements) {
this.elements = elements;
Collections.sort(this.elements);
}
public Iterator<List<T>> iterator() {
return new PermutationsIterator(elements);
}
public Stream<List<T>> stream() {
return StreamSupport.stream(this.spliterator(), false);
}
}
private static class PossibleConfigurations implements Iterable<List<Integer>> {
private List<Integer> initial;
private int clue;
private void generateInitial(int size) {
initial = new ArrayList<Integer>();
for (int i = 0; i < size; i++) {
initial.add(i + 1);
}
}
public PossibleConfigurations(int size, int clue) {
generateInitial(size);
this.clue = clue;
}
public Iterator<List<Integer>> iterator() {
if (clue == 0) {
return (new Permutations(initial)).iterator();
}
return (new Permutations(initial))
.stream()
.filter(heights -> isValid((List<Integer>) heights, clue))
.iterator();
}
}
private static boolean isValid(List<Integer> heights, int clue) {
int canSee = 1;
int lastHeight = heights.get(0);
for (int i = 1; i < heights.size(); i++) {
int currentHeight = heights.get(i);
if (currentHeight > lastHeight) {
lastHeight = currentHeight;
canSee++;
}
}
return canSee == clue;
}
private static int getDx(int clueIndex) {
if (clueIndex >= 4 && clueIndex <= 7) {
return -1;
}
if (clueIndex >= 12) {
return 1;
}
return 0;
}
private static int getDy(int clueIndex) {
if (clueIndex <= 3) {
return 1;
}
if (clueIndex >= 8 && clueIndex <= 11) {
return -1;
}
return 0;
}
private static int getStartX(int clueIndex) {
if (clueIndex < 4) {
return clueIndex;
}
if (clueIndex <= 7) {
return 3;
}
if (clueIndex <= 11) {
return 3 - clueIndex % 4;
}
return 0;
}
private static int getStartY(int clueIndex) {
if (clueIndex < 4) {
return 0;
}
if (clueIndex <= 7) {
return clueIndex % 4;
}
if (clueIndex <= 11) {
return 3;
}
return 3 - clueIndex % 4;
}
private static List<Integer> backupHeights(int[][] heights, int clueIndex) {
List<Integer> backup = new ArrayList<Integer>();
int dx = getDx(clueIndex);
int dy = getDy(clueIndex);
for (
int x = getStartX(clueIndex), y = getStartY(clueIndex);
x >= 0 && x < 4 && y >= 0 && y < 4;
x += dx, y += dy
) {
backup.add(heights[y][x]);
}
return backup;
}
private static boolean emplaceHeights(
int[][] heights, int clueIndex, List<Integer> newHeights, boolean force
) {
int i = 0;
int dx = getDx(clueIndex);
int dy = getDy(clueIndex);
for (
int x = getStartX(clueIndex), y = getStartY(clueIndex);
x >= 0 && x < 4 && y >= 0 && y < 4;
x += dx, y += dy
) {
if (
!force && heights[y][x] != 0 && heights[y][x] != newHeights.get(i)
) {
return false;
}
heights[y][x] = newHeights.get(i++);
}
return true;
}
private static boolean solvePuzzle(
int[][] heights, int[] clues, int clueIndex, boolean ignoreZeroes
) {
while (clueIndex < 16 && ((ignoreZeroes && clues[clueIndex] == 0) || (!ignoreZeroes && clues[clueIndex] != 0))) {
clueIndex++;
}
if (clueIndex >= 16) {
return true;
}
// create copy of heights to ensure correct resetting
List<Integer> currentHeights = backupHeights(heights, clueIndex);
// iterate through the options
for (List<Integer> possibleHeights : new PossibleConfigurations(4, clues[clueIndex])) {
// emplace heights and if conflict occurs, reset and try next one
if (!emplaceHeights(heights, clueIndex, possibleHeights, false)) {
emplaceHeights(heights, clueIndex, currentHeights, true);
continue;
}
// if no conflict present, try filling out other clues
if (solvePuzzle(heights, clues, clueIndex + 1, ignoreZeroes)) {
return true;
}
// otherwise reset heights and try again
emplaceHeights(heights, clueIndex, currentHeights, true);
}
// if we got here, there is no feasible configuration of buildings
return false;
}
static int[][] solvePuzzle(int[] clues) {
var result = new int[4][4];
solvePuzzle(result, clues, 0, true);
// in case there are left zeroes
solvePuzzle(result, clues, 0, false);
return result;
}
}

44
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using System;
public class Kata {
public static (uint remainder, uint digit) SumTwo(char a, char b, uint c = 0) {
uint val_a = (uint) a - 48;
uint val_b = (uint) b - 48;
var sum = val_a + val_b + c;
return (sum / 10, sum % 10);
}
public static string Add(string a, string b) {
var result = "";
if (a.Length > b.Length) {
var temp = a;
a = b;
b = temp;
}
int idx_a = a.Length - 1;
int idx_b = b.Length - 1;
uint remainder = 0;
uint last_digit = 0;
while (idx_a >= 0) {
(remainder, last_digit) = SumTwo(a[idx_a], b[idx_b], remainder);
result = last_digit.ToString() + result;
idx_a--;
idx_b--;
}
while (idx_b >= 0) {
(remainder, last_digit) = SumTwo('0', b[idx_b], remainder);
result = last_digit.ToString() + result;
idx_b--;
}
if (remainder > 0) {
result = remainder.ToString() + result;
}
return result;
}
}

61
4kyu/breadcrumb_generator/solution.js Normal file
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function checkExtension(name) {
const extensions = ['.html', '.htm', '.php', '.asp'];
return name.replace(/\.html/g, '').replace(/\.htm/g, '').replace(/\.php/g, '').replace(/\.asp/g, '');
}
function shorten(name) {
if (name.length <= 30) {
name = name.replace(/-/g, ' ');
} else {
const ignore = ["the","of","in","from","by","with","and", "or", "for", "to", "at", "a"];
name = name.split('-').filter(e => !ignore.includes(e)).map(e => e[0]);
name = name.join('');
}
return name.toUpperCase();
}
function buildSegment(url, name, last=false) {
if (last) {
return `<span class="active">${shorten(checkExtension(name))}</span>`;
} else {
return `<a href="${url}">${shorten(checkExtension(name))}</a>`;
}
}
function generateBC(url, separator) {
console.log(url);
if (url.includes('//')) {
url = url.split('//')[1];
}
url = url.split("/").filter(e => {
return !e.startsWith('index');
}).map(e => {
if (e.includes("#"))
return e.substring(0, e.indexOf("#"));
else if (e.includes("?"))
return e.substring(0, e.indexOf("?"));
else
return e;
});
let result = [];
let path = '/';
if ((url.length == 2 && url[1] == '') || url.length == 1) {
result.push(buildSegment('/', 'home', true));
return result.join('');
} else
result.push(buildSegment('/', 'home'));
for (let i = 1; i < url.length - 1; i++) {
path += `${url[i]}/`;
result.push(buildSegment(path, url[i]));
}
path += `/${url[url.length - 1]}`
result.push(buildSegment(path, url[url.length - 1], true));
return result.join(separator);
}

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4kyu/counting_change_combinations/solution.cs Normal file
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using System;
public static class Kata {
public static int CountCombinations(int money, int[] coins, bool recursivelyCalled = false) {
if (money == 0 && recursivelyCalled) return 1;
else if (coins.GetLength(0) == 1) {
if (money % coins[0] == 0) return 1;
else return 0;
} else if (!recursivelyCalled) {
Array.Sort(coins);
Array.Reverse(coins);
}
var result = 0;
var times = money / coins[0];
var newCoins = new int[coins.GetLength(0) - 1];
for (var i = 0; i < coins.GetLength(0) - 1; i++)
newCoins[i] = coins[i + 1];
for (var i = 0; i <= times; i++) {
result += CountCombinations(money - i * coins[0], newCoins, true);
}
return result;
}
}

115
4kyu/es5_generators_i/solution.js Normal file
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function generator(sequencer) {
return sequencer.apply(
null,
[]
.slice
.call(arguments)
.slice(1)
);
}
function dummySeq() {
this.next = function() {
return "dummy";
};
return this;
}
function factorialSeq() {
this.n = 1;
this.i = 0;
this.next = function() {
const value = this.n;
this.i++;
this.n *= this.i;
return value;
};
return this;
}
function fibonacciSeq() {
this.prev = 0;
this.current = 1;
this.next = function() {
const value = this.current;
const newValue = this.prev + this.current;
this.prev = this.current;
this.current= newValue;
return value;
};
return this;
}
function rangeSeq(start, step) {
this.value = start;
this.step = step;
this.next = function() {
const oldValue = this.value;
this.value += this.step;
return oldValue;
};
return this;
}
function primeSeq() {
const isPrime = function(n) {
const top = Math.floor(Math.sqrt(n));
for (let i = 2; i <= top; i++) {
if (n % i == 0) {
return false;
}
}
return true;
};
const nextPrime = function(n) {
n++;
while (!isPrime(n)) {
n++;
}
return n;
};
this.p = 1;
this.next = function() {
this.p = nextPrime(this.p);
return this.p;
};
return this;
}
function partialSumSeq() {
this.values = arguments;
this.length = arguments.length;
this.runningSum = 0;
this.i = 0;
this.next = function() {
if (this.i >= this.length) {
throw new RangeError("All input was processed!");
}
this.runningSum += this.values[this.i++];
return this.runningSum;
};
return this;
}

39
4kyu/human_readable_duration_format/solution.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
public class HumanTimeFormat{
private static Dictionary<string, int> conversions = new Dictionary<string, int>() {
{"year", 31536000},
{"day", 86400},
{"hour", 3600},
{"minute", 60},
{"second", 1}
};
public static string formatDuration(int seconds){
if (seconds == 0) return "now";
var results = new List<string>();
foreach (var pair in conversions) {
var units = seconds / pair.Value;
seconds %= pair.Value;
if (units > 0) {
var part = $"{units} {pair.Key}";
if (units > 1) {
part += "s";
}
results.Add(part);
}
}
if (results.Count == 1) return results[0];
else {
var last = results.Last();
results.Remove(last);
var result = String.Join(", ", results);
return result + " and " + last;
}
}
}

15
4kyu/magnet_particules_in_boxes/solution.cs Normal file
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using System;
public class Magnets
{
public static double Doubles(int maxk, int maxn)
{
double val = 0;
for (int k = 1; k <= maxk; k++)
for (int n = 1; n <= maxn; n++)
val += 1 / (k * Math.Pow(n + 1, 2 * k));
return val;
}
}

44
4kyu/matrix_determinant/solution.cpp Normal file
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#include <cmath>
#include <iostream>
#include <vector>
using namespace std;
vector<vector<long long>> transform(vector<vector<long long>> m, int row,
int col) {
vector<vector<long long>> result;
for (int i = 0; i < m.size(); i++) {
if (i == row)
continue;
vector<long long> actual_row;
for (int j = 0; j < m[i].size(); j++) {
if (j == col)
continue;
actual_row.push_back(m[i][j]);
}
result.push_back(actual_row);
}
return result;
}
long long determinant(vector<vector<long long>> m) {
switch (m.size()) {
case 1:
return m[0][0];
break;
case 2:
return m[0][0] * m[1][1] - m[0][1] * m[1][0];
break;
}
long long result = 0;
for (int i = 0; i < m.size(); i++) {
auto l_m = transform(m, i, 0);
result += pow(-1, i + 2) * m[i][0] * determinant(l_m);
}
return result;
}

65
4kyu/next_bigger_with_same_digits/solution.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
public class Kata {
public static List<long> ExtractDigits(long n) {
var result = new List<long>();
while (n > 0) {
result.Add(n % 10);
n /= 10;
}
result.Reverse();
return result;
}
public static bool NextPermutation(List<long> digits) {
// foreach (var digit in digits) Console.Write($"{digit} ");
// Console.WriteLine();
var k = -1;
for (var i = 0; i < digits.Count - 1; i++) {
if (digits[i] < digits[i + 1])
k = i;
}
if (k == -1) return false;
var l = k;
for (var i = 0; i < digits.Count; i++)
if (digits[k] < digits[i]) l = i;
if (l == k) return false;
var tmp = digits[k];
digits[k] = digits[l];
digits[l] = tmp;
// foreach (var digit in digits) Console.Write($"{digit} ");
// Console.WriteLine();
digits.Reverse(k + 1, digits.Count - k - 1);
// foreach (var digit in digits) Console.Write($"{digit} ");
// Console.WriteLine();
return true;
}
public static long NextBiggerNumber(long n) {
if (n < 10) return -1;
var digits = ExtractDigits(n);
if (!NextPermutation(digits)) {
return -1;
} else {
var result = 0l;
foreach (var digit in digits) {
result *= 10;
result += digit;
}
return result;
}
}
}

47
4kyu/permutations/solution.cpp Normal file
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#include <algorithm>
#include <iostream>
#include <set>
#include <string>
#include <vector>
template <typename T> bool nextPermutation(std::vector<T> &vec) {
// Find non-increasing suffix
if (vec.empty())
return false;
typename std::vector<T>::iterator i = vec.end() - 1;
while (i > vec.begin() && *(i - 1) >= *i)
--i;
if (i == vec.begin())
return false;
// Find successor to pivot
typename std::vector<T>::iterator j = vec.end() - 1;
while (*j <= *(i - 1))
--j;
std::iter_swap(i - 1, j);
// Reverse suffix
std::reverse(i, vec.end());
return true;
}
std::vector<std::string> permutations(std::string s) {
std::set<std::string> strings;
std::vector<std::string> result;
std::vector<char> s_vec;
// copy string into vector
for (auto ch = s.begin(); ch != s.end(); ch++) {
s_vec.push_back(*ch);
}
// do the magic
std::sort(s_vec.begin(), s_vec.end());
do {
strings.insert(std::string(s_vec.begin(), s_vec.end()));
} while (nextPermutation(s_vec));
std::copy(strings.begin(), strings.end(), std::back_inserter(result));
return result;
}

24
4kyu/priori_incantatem/solution.js Normal file
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class Wand {
constructor(spells) {
this.history = [];
Object.assign(this, spells);
return new Proxy(this, {
get: (target, property) => {
const val = target[property];
if (typeof val === 'function') {
target.history.unshift(property);
}
return val;
}
});
}
prioriIncantatem() {
return this.history.slice(1, MAX_PRIOR_SPELLS + 1);
}
deletrius() {
this.history = ['deletrius'];
}
}

19
4kyu/pyramid_slide_down/solution.cs Normal file
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using System;
public class PyramidSlideDown
{
public static int LongestSlideDown(int[][] pyramid)
{
for (var i = pyramid.GetLength(0) - 2; i >= 0; i--) {
for (var j = 0; j <= i; j++) {
if (pyramid[i + 1][j] > pyramid[i + 1][j + 1]) {
pyramid[i][j] += pyramid[i + 1][j];
} else {
pyramid[i][j] += pyramid[i + 1][j + 1];
}
}
}
return pyramid[0][0];
}
}

28
4kyu/remove_zeros/solution.js Normal file
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function swap(array, i, j) {
let temporary = array[i];
array[i] = array[j];
array[j] = temporary;
}
function removeZeros(array) {
// Sort "array" so that all elements with the value of zero are moved to the
// end of the array, while the other elements maintain order.
// [0, 1, 2, 0, 3] --> [1, 2, 3, 0, 0]
// Zero elements also maintain order in which they occurred.
// [0, "0", 1, 2, 3] --> [1, 2, 3, 0, "0"]
// Do not use any temporary arrays or objects. Additionally, you're not able
// to use any Array or Object prototype methods such as .shift(), .push(), etc
// the correctly sorted array should be returned.
for (let i = array.length - 2; i > -1; i--) {
if (array[i] === 0 || array[i] === '0') {
for (let j = i; j < array.length - 1 && array[j + 1] !== 0 && array[j + 1] !== '0'; j++) {
swap(array, j, j + 1);
}
}
}
return array;
}

69
4kyu/route_calculator/solution.ts Normal file
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class Expression {
private static readonly INVALID_REQUEST: string = "400: Bad request";
value: string;
l: Expression | null = null;
r: Expression | null = null;
private splitBy(operation: string): boolean {
let splitOperands = this.value.split(operation);
if (splitOperands.length < 2) {
return false;
}
this.value = operation;
this.r = new Expression(splitOperands.pop());
this.l = new Expression(splitOperands.join(operation));
return true;
}
constructor(expr: string) {
this.value = expr;
for (let operation of "+-*$") {
if (this.splitBy(operation)) {
return;
}
}
}
public evaluate(): (number | string) {
if (this.l === null && this.r === null) {
// process constants
if (![...this.value].every(c => "0123456789.".includes(c))) {
return Expression.INVALID_REQUEST;
}
const val = Number.parseFloat(this.value);
return val;
}
if (this.l === null || this.r === null || !("+-$*".includes(this.value))) {
return Expression.INVALID_REQUEST;
}
const left = this.l.evaluate();
const right = this.r.evaluate();
if (typeof left !== "number" || typeof right !== "number") {
return Expression.INVALID_REQUEST;
}
let operation = null;
switch (this.value) {
case "+":
return left + right;
case "-":
return left - right;
case "$":
return left / right;
case "*":
return left * right;
}
}
}
export const calculate = (sum: string): (number | string) => {
return new Expression(sum).evaluate();
}

57
4kyu/simplistic_tcp_fsm/solution.cs Normal file
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using System;
using System.Collections.Generic;
public class TCP {
private static bool IsInitialized = false;
private static Dictionary<string, Dictionary<string, string>> Transitions = new Dictionary<string, Dictionary<string, string>>();
private static void InitializeIfNeeded() {
if (IsInitialized) {
return;
}
IsInitialized = true;
var transitions = new List<(string, string, string)>() {
("CLOSED", "APP_PASSIVE_OPEN" , "LISTEN"),
("CLOSED", "APP_ACTIVE_OPEN" , "SYN_SENT"),
("LISTEN", "RCV_SYN" , "SYN_RCVD"),
("LISTEN", "APP_SEND" , "SYN_SENT"),
("LISTEN", "APP_CLOSE" , "CLOSED"),
("SYN_RCVD", "APP_CLOSE" , "FIN_WAIT_1"),
("SYN_RCVD", "RCV_ACK" , "ESTABLISHED"),
("SYN_SENT", "RCV_SYN" , "SYN_RCVD"),
("SYN_SENT", "RCV_SYN_ACK" , "ESTABLISHED"),
("SYN_SENT", "APP_CLOSE" , "CLOSED"),
("ESTABLISHED", "APP_CLOSE" , "FIN_WAIT_1"),
("ESTABLISHED", "RCV_FIN" , "CLOSE_WAIT"),
("FIN_WAIT_1", "RCV_FIN" , "CLOSING"),
("FIN_WAIT_1", "RCV_FIN_ACK" , "TIME_WAIT"),
("FIN_WAIT_1", "RCV_ACK" , "FIN_WAIT_2"),
("CLOSING", "RCV_ACK" , "TIME_WAIT"),
("FIN_WAIT_2", "RCV_FIN" , "TIME_WAIT"),
("TIME_WAIT", "APP_TIMEOUT" , "CLOSED"),
("CLOSE_WAIT", "APP_CLOSE" , "LAST_ACK"),
("LAST_ACK", "RCV_ACK" , "CLOSED"),
};
foreach (var (fromState, byEvent, toState) in transitions) {
var fromStateDictionary = Transitions.GetValueOrDefault(fromState, new Dictionary<string, string>());
fromStateDictionary.Add(byEvent, toState);
Transitions[fromState] = fromStateDictionary;
}
}
public static string TraverseStates(string[] events) {
InitializeIfNeeded();
var state = "CLOSED"; // initial state, always
foreach (var ev in events) {
state = Transitions
.GetValueOrDefault(state, new Dictionary<string, string>())
.GetValueOrDefault(ev, "ERROR");
}
return state;
}
}

46
4kyu/snail/solution.cs Normal file
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using System;
public class SnailSolution {
private static void Update(ref int dx, ref int dy) {
int newDx = -dy, newDy = dx;
dy = newDy;
dx = newDx;
}
public static int[] Snail(int[][] array) {
if (array.Length == 1 && array[0].Length == 0) {
return new int[] {};
}
int[] result = new int[array.Length * array.Length];
int y = 0, x = 0;
int dy = 0, dx = 1;
int left = -1, right = array.Length;
int top = 0, bottom = array.Length;
for (var i = 0; i < result.Length; i++) {
result[i] = array[y][x];
if (dx != 0 && x + dx <= left) {
left++;
Update(ref dx, ref dy);
} else if (dx != 0 && x + dx >= right) {
right--;
Update(ref dx, ref dy);
} else if (dy != 0 && y + dy <= top) {
top++;
Update(ref dx, ref dy);
} else if (dy != 0 && y + dy >= bottom) {
bottom--;
Update(ref dx, ref dy);
}
x += dx;
y += dy;
}
return result;
}
}

53
4kyu/sudoku_solution_validator/solution.cs Normal file
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using System.Collections.Generic;
public class Sudoku {
private static readonly int FULL = (~(((~0) >> 9) << 9)) << 1;
private static IEnumerable<(int, int)> Row(int row) {
for (var col = 0; col < 9; col++) {
yield return (row, col);
}
}
private static IEnumerable<(int, int)> Column(int column) {
for (var row = 0; row < 9; row++) {
yield return (row, column);
}
}
private static IEnumerable<(int, int)> Box(int k) {
var row = 3 * (k / 3);
var col = 3 * (k % 3);
for (var i = 0; i < 3; i++) {
for (var j = 0; j < 3; j++) {
yield return (row + i, col + j);
}
}
}
private static bool Valid(int[][] board, IEnumerable<(int, int)> coordinates) {
var encountered = 0;
foreach (var (row, col) in coordinates) {
if (board[row][col] == 0) {
return false;
} else if ((encountered & (1 << board[row][col])) != 0) {
return false;
}
encountered |= 1 << board[row][col];
}
return encountered == FULL;
}
public static bool ValidateSolution(int[][] board) {
for (var i = 0; i < 9; i++) {
if (!Valid(board, Row(i)) || !Valid(board, Column(i)) || !Valid(board, Box(i))) {
return false;
}
}
return true;
}
}

29
4kyu/sum_by_factors/solution.rs Normal file
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use std::vec::Vec;
fn is_prime(n: i64) -> bool {
match n {
x if x % 2 == 0 => x == 2,
_ => {
let max_value = (n as f64).sqrt().ceil() as i64;
(3..max_value + 1).step_by(2).all(|i| n % i != 0)
}
}
}
pub fn sum_of_divided(l: Vec<i64>) -> Vec<(i64, i64)> {
let max_value = l.iter().max_by_key(|x| x.abs());
match max_value {
Some(max_val) => (2..max_val.abs() + 1)
.filter(|&i| is_prime(i) && l.iter().any(|x| x % i == 0))
.map(|i| {
(
i,
l.iter()
.fold(0, |acc, &x| acc + if x % i == 0 { x } else { 0 }),
)
})
.collect(),
None => vec![],
}
}

63
4kyu/sum_strings_as_numbers/solution.cs Normal file
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using System;
public static class Kata {
public static string sumStrings(string a, string b) {
var result = "";
var i = a.Length - 1;
var j = b.Length - 1;
var remainder = 0;
while (i >= 0 && j >= 0) {
var a_digit = a[i] - '0';
var b_digit = b[j] - '0';
var sum = a_digit + b_digit + remainder;
result = (sum % 10) + result;
if (sum >= 10) {
remainder = sum / 10;
} else {
remainder = 0;
}
i--;
j--;
}
while (i >= 0) {
var a_digit = a[i] - '0';
var sum = a_digit + remainder;
result = (sum % 10) + result;
if (sum >= 10) {
remainder = sum / 10;
} else {
remainder = 0;
}
i--;
}
while (j >= 0) {
var b_digit = b[j] - '0';
var sum = b_digit + remainder;
result = (sum % 10) + result;
if (sum >= 10) {
remainder = sum / 10;
} else {
remainder = 0;
}
j--;
}
if (remainder > 0) {
result = remainder + result;
}
return result.TrimStart('0');
}
}

29
4kyu/the_observed_pin/solution.cs Normal file
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using System.Collections.Generic;
using System.Linq;
public class Kata {
private static Dictionary<char, string> Possible = new Dictionary<char, string>() {
{ '1', "124"}, { '2', "1235" }, { '3', "236" },
{ '4', "1457"}, { '5', "24568" }, { '6', "3569" },
{ '7', "478"}, { '8', "57890" }, { '9', "689" },
{ '0', "80" }
};
public static List<string> GetPINs(string observed) {
var result = new HashSet<string>() {
""
};
foreach (char observedDigit in observed) {
var possibleDigits = Possible[observedDigit];
result = new HashSet<string>(
result
.Select(pin => possibleDigits.Select(d => pin + d))
.Aggregate((acc, e) => acc.Union(e))
);
}
return result.ToList();
}
}

31
4kyu/twice_linear/solution.js Normal file
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function dblLinear(n) {
let values = [1];
let seen = new Set(values);
let index = 0;
let length = 0;
while (length < n) {
const x = values.shift();
seen.delete(x);
const a = 2 * x + 1;
const b = 3 * x + 1;
if (!seen.has(a)) {
let i = index;
for (;i < values.length; i++)
if (values[i] > a)
break;
values.splice(i, 0, a);
seen.add(a);
index = i;
}
seen.add(b);
values.push(b);
length++;
}
console.log(values);
return values[0];
}

15
5kyu/buddy_pairs/solution.kt Normal file
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fun getSumOfDivisors(n: Long): Long =
(1 until Math.sqrt(n.toDouble()).toLong() + 1).reduce {
acc, e -> acc + if (n.rem(e) == 0.toLong()) e + n.div(e) else 0.toLong()
}
fun buddy(start: Long, limit: Long): String {
for (n in start..limit) {
val m = getSumOfDivisors(n) - 1
if (m > n && getSumOfDivisors(m) - 1 == n) {
return "($n $m)"
}
}
return "Nothing"
}

15
5kyu/calculating_with_functions/solution.js Normal file
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function zero(operand=null) { return (operand) ? operand(0) : 0; }
function one(operand=null) { return (operand) ? operand(1) : 1; }
function two(operand=null) { return (operand) ? operand(2) : 2; }
function three(operand=null) { return (operand) ? operand(3) : 3; }
function four(operand=null) { return (operand) ? operand(4) : 4; }
function five(operand=null) { return (operand) ? operand(5) : 5; }
function six(operand=null) { return (operand) ? operand(6) : 6; }
function seven(operand=null) { return (operand) ? operand(7) : 7; }
function eight(operand=null) { return (operand) ? operand(8) : 8; }
function nine(operand=null) { return (operand) ? operand(9) : 9; }
function plus(right) { return (x) => x + right; }
function minus(right) { return (x) => x - right; }
function times(right) { return (x) => x * right; }
function dividedBy(right) { return (x) => Math.floor(x / right); }

32
5kyu/common_denominators/solution.cs Normal file
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using System;
public class Fracts {
public static string convertFrac(long[,] lst)
{
if (lst.GetLength(0) < 1) return "";
long denominator = lst[0, 1];
string result = "";
for (int i = 0; i < lst.GetLength(0); i++) denominator = LeastCommonMultiple(denominator, lst[i, 1]);
for (int i = 0; i < lst.GetLength(0); i++)
{
long factor = denominator / lst[i, 1];
result += String.Format("({0},{1})", lst[i, 0] * factor, lst[i, 1] * factor);
}
return result;
}
public static long GreatestCommonDivisor(long a, long b)
{
if (b == 0) return a;
else return GreatestCommonDivisor(b, a % b);
}
public static long LeastCommonMultiple(long a, long b)
{
return a * b / GreatestCommonDivisor(a, b);
}
}

13
5kyu/convert_a_hex_string_to_rgb/solution.c Normal file
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#include <stdio.h>
typedef struct {
int r, g, b;
} rgb;
rgb hex_str_to_rgb(const char *hex_str) {
rgb result;
sscanf(hex_str, "#%2x%2x%2x", &result.r, &result.g, &result.b);
return result;
}

10
5kyu/count_ip_addresses/solution.rs Normal file
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fn parse_ip(ip_str: &str) -> u32 {
ip_str
.split(".")
.map(|octet| octet.parse::<u32>().unwrap())
.fold(0, |ip, octet| (ip << 8) | octet)
}
pub fn ips_between(start: &str, end: &str) -> u32 {
parse_ip(end) - parse_ip(start)
}

57
5kyu/did_i_finish_my_sudokou/solution.js Normal file
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function checkSet(set) {
if (set.size != 9) {
return false;
} else {
for (let num = 1; num <= 9; num++) {
if (!set.has(num)) {
return false;
}
}
}
return true;
}
function doneOrNot(board) {
const positive = "Finished!";
const negative = "Try again!";
// Check rows
for (let row of board) {
row = new Set(row);
if (!checkSet(row)) {
return negative;
}
}
// Check columns
for (let col = 0; col < 9; col++) {
// Construct set for a column
let column = new Set();
for (let i = 0; i < 9; i++) {
column.add(board[i][col]);
}
if (!checkSet(column)) {
return negative;
}
}
// Check boxes
for (let i = 0; i < 9; i += 3) {
for (let j = 0; j < 9; j += 3) {
// Construct set of a box
let box = new Set();
for (let k = 0; k < 3; k++) {
box.add(board[i + k][j]).add(board[i][j + k]).add(board[i + k][j + k]);
}
box.add(board[i + 2][j + 1]).add(board[i + 1][j + 2]);
if (!checkSet(box)) {
return negative;
}
}
}
return positive;
}

20
5kyu/directions_reduction/solution.hs Normal file
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module Codewars.Kata.Reduction where
import Codewars.Kata.Reduction.Direction
-- data Direction = North | East | West | South deriving (Eq)
areOpposite :: Direction -> Direction -> Bool
areOpposite North South = True
areOpposite South North = True
areOpposite East West = True
areOpposite West East = True
areOpposite _ _ = False
folding :: Direction -> [Direction] -> [Direction]
folding x [] = [x]
folding x (y:rest) | areOpposite x y = rest
| otherwise = x:y:rest
dirReduce :: [Direction] -> [Direction]
dirReduce [] = []
dirReduce directions = foldr folding [] directions

61
5kyu/esolang_interpreters_ii/solution.swift Normal file
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func interpreter(_ code: String, _ tape: String) -> String {
func fromTape(stringTape: String) -> [Int] {
return stringTape.map({ c in (c == "0") ? 0 : 1 })
}
func toTape(intTape: [Int]) -> String {
return intTape.reduce("", { x, b in x + (b == 0 ? "0" : "1") })
}
func findComplement(direction: Int, startIndex: Int, l: Character, r: Character) -> Int {
var depth = 0
var i = startIndex
repeat {
let c = code[code.index(code.startIndex, offsetBy: i)]
if c == l {
depth += 1
} else if c == r {
depth -= 1
}
i += direction
} while depth != 0
return i
}
var bits = fromTape(stringTape: tape)
var i = 0
var codeIndex = 0
while codeIndex >= 0 && codeIndex < code.count {
switch code[code.index(code.startIndex, offsetBy: codeIndex)] {
case ">":
i += 1
case "<":
i -= 1
case "*":
bits[i] = (bits[i] + 1) % 2
case "[":
if bits[i] == 0 {
codeIndex = findComplement(direction: 1, startIndex: codeIndex, l: "[", r: "]") - 1
}
case "]":
if bits[i] != 0 {
codeIndex = findComplement(direction: -1, startIndex: codeIndex, l: "]", r: "[")
}
default:
break
}
codeIndex += 1
if i < 0 || i >= bits.count {
break
}
}
return toTape(intTape: bits)
}

48
5kyu/greed_is_good/solution.cpp Normal file
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#include <map>
#include <tuple>
#include <vector>
std::map<int, int> process_dice(const std::vector<int>& dice) {
std::map<int, int> freqs;
for (auto val : dice) {
freqs[val]++;
}
return freqs;
}
int score(const std::vector<int>& dice) {
const std::map<std::tuple<int, int>, int> options{
{{3, 1}, 1000},
{{3, 6}, 600},
{{3, 5}, 500},
{{3, 4}, 400},
{{3, 3}, 300},
{{3, 2}, 200}
};
auto counts = process_dice(dice);
auto total = 0;
for (auto has_changed = true; has_changed;) {
has_changed = false;
for (const auto& [option, points] : options) {
const auto& [count, die] = option;
if (counts[die] >= count) {
counts[die] -= count;
total += points;
has_changed = true;
break;
}
}
}
total += counts[1] * 100;
total += counts[5] * 50;
return total;
}

24
5kyu/halloween_sweets/solution.js Normal file
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function pick(bags, scale) {
if (bags.length == 1) {
return bags[0];
}
let sets = [];
let sizeOfSet = bags.length / 3;
for (let i = 0; i < bags.length; i += sizeOfSet) {
sets.push(bags.slice(i, i + sizeOfSet));
}
switch (scale.weigh(sets[0], sets[1])) {
case -1:
return pick(sets[0], scale);
break;
case 0:
return pick(sets[2], scale);
break;
case 1:
return pick(sets[1], scale);
break;
}
}

14
5kyu/human_readable_time/solution.cs Normal file
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using System;
public static class TimeFormat
{
public static string GetReadableTime(int seconds)
{
var hours = seconds / 3600;
seconds %= 3600;
var minutes = seconds / 60;
seconds %= 60;
return String.Format("{0:00}:{1:00}:{2:00}", hours, minutes, seconds);
}
}

6
5kyu/i32_to_ipv4/solution.c Normal file
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#include <inttypes.h>
#include <stdio.h>
void uint32_to_ip(uint32_t ip, char *output) {
sprintf(output, "%d.%d.%d.%d", (ip >> 24) & 0xFF, (ip >> 16) & 0xFF, (ip >> 8) & 0xFF, ip & 0xFF);
}

46
5kyu/is_my_friend_cheating/solution.cpp Normal file
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#include <vector>
#include <cmath>
class RemovedNumbers
{
static long long get_lower_bound(long long n);
static long long get_complement(long long ax, long long n);
public:
static std::vector<std::vector<long long>> removNb(long long n);
};
long long RemovedNumbers::get_lower_bound(long long n)
{
return (long long)ceil((2 * n - n * n - n) / (-2 * n - 2.0));
}
long long RemovedNumbers::get_complement(long long ax, long long n)
{
auto result = (0.5 * (n * n + n) - ax) / (ax + 1);
if (floor(result) == result)
{
return (long long)result;
}
else
{
return 0;
}
}
std::vector<std::vector<long long>> RemovedNumbers::removNb(long long n)
{
std::vector<std::vector<long long>> result;
for (long long ax = get_lower_bound(n); ax <= n; ax++)
{
auto complement = get_complement(ax, n);
if (complement != 0)
{
result.push_back({ax, complement});
}
}
return result;
}

4
5kyu/maximum_subarray_sum/solution.kt Normal file
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fun maxSequence(arr: List<Int>): Int =
arr.scan(0) { k, it ->
maxOf(k, 0) + it
}.maxOrNull() ?: 0

12
5kyu/memoized_fibonacci/solution.py Normal file
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fibonacci_memory = {}
def fibonacci(n):
if n in [0, 1]:
return n
if n not in fibonacci_memory:
value = fibonacci(n - 1) + fibonacci(n - 2)
fibonacci_memory[n] = value
return value
else:
return fibonacci_memory[n]

13
5kyu/moving_zeros_to_the_end/solution.cs Normal file
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using System.Collections.Generic;
using System.Linq;
public class Kata {
public static int[] MoveZeroes(int[] arr) {
var length = arr.GetLength(0);
var new_arr = arr.Where(x => x != 0).ToList();
for (var i = length - new_arr.Count(); i > 0; i--) new_arr.Add(0);
return new_arr.ToArray();
}
}

86
5kyu/my_smallest_code_interpreter_bf/solution.rs Normal file
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use std::collections::HashMap;
fn find_left(instructions: &[u8], index: usize) -> usize {
let mut result = index - 1;
let mut count = 1;
while count != 0 {
if instructions[result] == ']' as u8 {
count += 1;
} else if instructions[result] == '[' as u8 {
count -= 1;
}
result -= 1;
}
result + 1
}
fn find_right(instructions: &[u8], index: usize) -> usize {
let mut result = index + 1;
let mut count = 1;
while count != 0 {
if instructions[result] == '[' as u8 {
count += 1;
} else if instructions[result] == ']' as u8 {
count -= 1;
}
result += 1;
}
result - 1
}
fn brain_luck(code: &str, input: Vec<u8>) -> Vec<u8> {
let instructions = code.as_bytes();
let mut result = Vec::<u8>::new();
let mut tape = HashMap::<i64, i16>::new();
let mut i = 0;
let mut tape_i = 0;
let mut input_i = 0;
while i < instructions.len() {
match instructions[i] as char {
'>' => tape_i += 1,
'<' => tape_i -= 1,
'+' => {
tape.insert(tape_i, (tape.get(&tape_i).unwrap_or(&0) + 1) % 256);
()
}
'-' => {
let new_value = tape.get(&tape_i).unwrap_or(&0) - 1;
tape.insert(tape_i, if new_value < 0 { 255 } else { new_value });
()
}
'.' => {
result.push(*tape.get(&tape_i).unwrap_or(&0) as u8);
()
}
',' => {
tape.insert(tape_i, input[input_i] as i16);
input_i += 1;
()
}
'[' => {
if *tape.get(&tape_i).unwrap_or(&0) == 0 {
i = find_right(instructions, i);
}
()
}
']' => {
if *tape.get(&tape_i).unwrap_or(&0) != 0 {
i = find_left(instructions, i);
}
()
}
_ => {}
}
i += 1;
}
result
}

16
5kyu/number_of_trailing_zeros_of_nf/solution.cs Normal file
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using System;
public static class Kata
{
public static int TrailingZeros(int n)
{
var sum = 0.0;
var max = Math.Floor(Math.Log(n)/Math.Log(5));
for (var i = 1; i <= max; i++) {
sum += Math.Floor(n / Math.Pow(5, i));
}
return (int) sum;
}
}

21
5kyu/perimeter_of_squares_in_a_rectangle/solution.rs Normal file
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use std::vec::Vec;
fn fibonacci(n: u64) -> Vec<u64> {
match n {
0 => vec![1],
1 => vec![1, 1],
_ => {
let mut result = vec![1, 1];
for i in 2..(n as usize + 1) {
result.push(result[i - 1] + result[i - 2]);
}
result
}
}
}
pub fn perimeter(n: u64) -> u64 {
fibonacci(n).iter().fold(0, |acc, x| acc + 4 * x)
}

16
5kyu/rgb_to_hex_conversion/solution.cs Normal file
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public class Kata
{
public static int Constrain(int val, int min, int max) {
if (val < min) return min;
else if (val > max) return max;
else return val;
}
public static string Rgb(int r, int g, int b)
{
r = Constrain(r, 0, 255);
g = Constrain(g, 0, 255);
b = Constrain(b, 0, 255);
return $"{r,2:X2}{g,2:X2}{b,2:X2}";
}
}

17
5kyu/rot13/solution.js Normal file
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function rot13(message) {
let result = "";
for (let character of message) {
let val = character.charCodeAt();
if (val >= 97 && val <= 122) {
result += String.fromCharCode(97 + (val - 97 + 13) % 26);
} else if (val >= 65 && val <= 90) {
result += String.fromCharCode(65 + (val - 65 + 13) % 26);
} else {
result += character;
}
}
return result;
}

19
5kyu/scramblies/solution.cs Normal file
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using System;
using System.Collections.Generic;
public class Scramblies {
public static bool Scramble(string str1, string str2) {
var list = new List<char>(str1.ToCharArray());
list.Sort();
foreach (char letter in str2) {
if (list.Contains(letter)) {
list.Remove(letter);
} else {
return false;
}
}
return true;
}
}

38
5kyu/simple_assembler_interpreter/solution.kt Normal file
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private fun constantOrRegister(token: String, regs: Map<String, Int>): Int =
token.toIntOrNull() ?: regs.getOrDefault(token, 0)
fun interpret(program: Array<String>): Map<String, Int> {
var result = mutableMapOf<String, Int>()
var instruction = 0
while (instruction in program.indices) {
val ops = program.elementAt(instruction).split(' ')
when (ops[0]) {
"mov" -> {
val value = constantOrRegister(ops[2], result)
result.put(ops[1], value)
}
"inc" -> {
val value = result.getOrDefault(ops[1], 0)
result.put(ops[1], value + 1)
}
"dec" -> {
val value = result.getOrDefault(ops[1], 0)
result.put(ops[1], value - 1)
}
"jnz" -> {
val diff = constantOrRegister(ops[2], result)
val cond = constantOrRegister(ops[1], result)
if (cond != 0) {
instruction = instruction + diff - 1
}
}
else -> error("invalid instruction")
}
instruction++
}
return result
}

9
5kyu/simple_pig_latin/solution.py Normal file
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def pig_it(text):
result = ''
for word in text.split():
if word in '.?!\',':
result += word + ' '
else:
result += word[1:] + word[0] + 'ay '
return result.strip()

62
5kyu/snakes_and_ladders/solution.cpp Normal file
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#include <map>
class SnakesLadders
{
private:
static std::map<int, int> sls;
int positions[2];
int player = 0;
public:
SnakesLadders(){
positions[0] = positions[1] = 0;
};
std::string play(int die1, int die2)
{
if (positions[0] == 100 || positions[1] == 100) {
return "Game over!";
} else {
positions[player] += die1 + die2;
if (positions[player] > 100) {
positions[player] = 100 - positions[player] % 100;
} else if (positions[player] == 100) {
return "Player " + std::to_string(player + 1) + " Wins!";
}
if (sls.find(positions[player]) != sls.end()) {
positions[player] = sls[positions[player]];
}
int p = player + 1;
if (die1 != die2) {
player = (player + 1) % 2;
}
return "Player " + std::to_string(p) + " is on square " + std::to_string(positions[p - 1]);
}
};
};
std::map<int, int> SnakesLadders::sls = {
{ 2, 38},
{ 7, 14},
{ 8, 31},
{15, 26},
{16, 6},
{21, 42},
{28, 84},
{36, 44},
{46, 25},
{49, 11},
{51, 67},
{62, 19},
{64, 60},
{71, 91},
{74, 53},
{78, 98},
{87, 94},
{89, 68},
{92, 88},
{95, 75},
{99, 80},
};

11
5kyu/sum_of_pairs/solution.py Normal file
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def sum_pairs(ints, s):
passed = {}
for num in ints:
other = s - num
if other in passed:
return [other, num]
else:
passed[num] = True
return None

32
5kyu/the_clockwise_spiral/solution.cpp Normal file
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#include <vector>
static void next_diff(int &dy, int &dx) {
int new_dx = -dy, new_dy = dx;
dy = new_dy;
dx = new_dx;
}
std::vector<std::vector<int>> create_spiral(int n) {
if (n < 1) {
return {};
}
auto result = std::vector<std::vector<int>>(
static_cast<size_t>(n), std::vector<int>( static_cast<size_t>(n), 0 )
);
int y = 0, x = 0;
int dy = 0, dx = 1;
for (int i = 1, max = n * n; i <= max; i++) {
result[y][x] = i;
if (y + dy == n || y + dy < 0 || x + dx == n || x + dx < 0 || result[y + dy][x + dx] != 0) {
next_diff(dy, dx);
}
y += dy;
x += dx;
}
return result;
}

7
5kyu/the_hashtag_generator/solution.js Normal file
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function generateHashtag (str) {
const result = str.split(/\s+/igm).reduce((accum, word) =>
accum + word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase()
, "#");
return (result.length > 140 || result == "#") ? false : result;
}

71
5kyu/tic_tac_toe_checker/solution.js Normal file
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function checkEmpty(board) {
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
if (board[i][j] === 0) {
return true;
}
}
}
}
function checkColumn(board, column) {
for (let i = 1; i < 3; i++) {
if (board[i - 1][column] !== board[i][column]) {
return 0;
}
}
return board[0][column];
}
function checkRow(board, row) {
for (let i = 1; i < 3; i++) {
if (board[row][i - 1] !== board[row][i]) {
return 0;
}
}
return board[row][0];
}
function checkDiagonal(board) {
let leftToRight = true;
let rightToLeft = true;
for (let i = 1; i < 3; i++) {
if (board[i - 1][i - 1] !== board[i][i]) {
leftToRight = false;
}
if (board[i - 1][3 - i] !== board[i][2 - i]) {
rightToLeft = false;
}
}
if (leftToRight) {
return board[0][0];
} else if (rightToLeft) {
return board[0][2];
} else {
return 0;
}
}
function isSolved(board) {
for (let i = 0; i < 3; i++) {
const col = checkColumn(board, i);
const row = checkRow(board, i);
if (col != 0) {
return col;
} else if (row != 0) {
return row;
}
}
const diagonal = checkDiagonal(board);
if (diagonal != 0) {
return diagonal;
}
if (checkEmpty(board)) {
return -1;
}
return 0;
}

11
5kyu/valid_parentheses/solution.py Normal file
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def valid_parentheses(string):
opened = 0
for letter in string:
if letter == '(':
opened += 1
elif letter == ')':
opened -= 1
if opened < 0:
return False
return opened == 0

54
5kyu/vector_class/solution.js Normal file
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class Vector {
constructor(array) {
this.values = array.slice(0);
}
mathOperation(vector, f) {
if (!vector || !(vector instanceof Vector) || this.values.length !== vector.values.length) {
throw "invalid operation";
}
let result = [];
for (let i = 0; i < this.values.length; i++) {
result.push(f(this.values[i], vector.values[i]));
}
return new Vector(result);
}
add(vector) {
return this.mathOperation(vector, (t, o) => t + o);
}
subtract(vector) {
return this.mathOperation(vector, (t, o) => t - o);
}
dot(vector) {
return this.mathOperation(vector, (t, o) => t * o)
.values.reduce((t, e) => t + e, 0);
}
norm() {
return Math.sqrt(this.dot(this));
}
toString() {
return `(${this.values.join(',')})`;
}
equals(other) {
if (!other || !(other instanceof Vector) || this.values.length !== other.values.length) {
return false;
} else if (other === this) {
return true;
} else {
for (let i = 0; i < this.values.length; i++) {
if (this.values[i] !== other.values[i]) {
return false;
}
}
return true;
}
}
}

22
5kyu/weight_for_weight/solution.py Normal file
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def digit_sum(n):
total = 0
while n > 0:
total += n % 10
n //= 10
return total
class Weight:
def __init__(self, weight):
self.weight = weight
self.digit_sum = digit_sum(weight)
def __lt__(self, other):
if self.digit_sum == other.digit_sum:
return str(self.weight) < str(other.weight)
return self.digit_sum < other.digit_sum
def __str__(self):
return str(self.weight)
def order_weight(strng):
return ' '.join(map(lambda e: str(e), sorted(map(lambda e: Weight(int(e)), strng.split()))))

15
5kyu/where_my_anagrams_at/solution.js Normal file
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function anagrams(word, words) {
word = word.split('');
word.sort();
word = word.join('');
let result = [];
for (let testedWord of words) {
twSorted = testedWord.split('');
twSorted.sort();
if (word == twSorted.join(''))
result.push(testedWord);
}
return result;
}

24
5kyu/which_x_for_that_sum/solution.rs Normal file
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fn solve_quadratic(a: f64, b: f64, c: f64) -> Option<(f64, f64)> {
let d = b * b - 4.0 * a * c;
if d < 0.0 {
None
} else {
Some(((-b + d.sqrt()) / (2.0 * a), (-b - d.sqrt()) / (2.0 * a)))
}
}
pub fn solve(m: f64) -> f64 {
match solve_quadratic(m, -2.0 * m - 1.0, m) {
Some((left, right)) => {
if left > 0.0 && left < 1.0 {
left
} else if right > 0.0 && right < 1.0 {
right
} else {
0.0
}
}
None => 0.0,
}
}

16
6kyu/are_they_the_same/solution.js Normal file
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function comp(array1, array2){
let squares = [];
for (let num of array1) {
squares.push(num * num);
}
if (!array2)
return false;
for (let square of array2) {
let index = squares.indexOf(square);
if (index != -1) squares.splice(index, 1);
}
if (squares.length > 0) return false;
else return true;
}

12
6kyu/ball_upwards/solution.kt Normal file
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package ball
val G = 9.81
fun maxBall(v0: Int): Int {
val v = v0 * 5 / 18.0
val maxT = v * 10 / G
return (0..maxT.toInt() + 1).maxBy {
v * it / 10.0 - 0.5 * G * it * it / 100.0
} ?: 0
}

7
6kyu/bit_counting/solution.py Normal file
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def countBits(n):
count = 0
while n > 0:
if n % 2 == 1:
count += 1
n //= 2
return count

9
6kyu/bouncing_balls/solution.py Normal file
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@ -0,0 +1,9 @@
def bouncingBall(h, bounce, window):
if h <= 0 or (bounce <= 0 or bounce >= 1) or window >= h:
return -1
result = -1
while h > window:
h *= bounce
result += 2
return result

25
6kyu/build_tower/solution.js Normal file
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String.prototype.centerJustify = function(length, char) {
let i = 0;
let str = this;
let toggle = true;
while (i + this.length < length) {
i++;
if (toggle)
str = str + char;
else
str = char + str;
toggle = !toggle;
}
return str;
}
function towerBuilder(nFloors) {
let floor = '*';
const width = nFloors * 2 - 1;
let result = [];
for (let i = 0, count = 1; i < nFloors; i++, count += 2) {
result.push(floor.centerJustify(width, ' '));
floor += '**';
}
return result;
}

30
6kyu/build_tower_advanced/solution.js Normal file
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String.prototype.centerJustify = function(length, char) {
let i = 0;
let str = this;
let toggle = true;
while (i + this.length < length) {
i++;
if (toggle)
str = str + char;
else
str = char + str;
toggle = !toggle;
}
return str;
}
function towerBuilder(nFloors, nBlockSz) {
let floor = '';
for (let i = 0; i < nBlockSz[0]; i++)
floor += '*';
const width = nFloors * 2 * nBlockSz[0] - nBlockSz[0];
let result = [];
for (let i = 0, count = 1; i < nFloors; i++, count += 2) {
for (let j = 0; j < nBlockSz[1]; j++) {
result.push(floor.centerJustify(width, ' '));
}
for (let j = 0; j < nBlockSz[0]; j++)
floor += '**';
}
return result;
}

19
6kyu/camelcase_method/solution.rs Normal file
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fn camel_case(str: &str) -> String {
let mut result = String::from("");
let mut was_space: bool = true;
for character in str.chars() {
if character.is_whitespace() {
was_space = true;
} else if character.is_alphabetic() {
if was_space {
result += &character.to_uppercase().to_string();
was_space = false;
} else {
result += &character.to_lowercase().to_string();
}
}
}
result.to_string()
}

12
6kyu/cheat_or_you_shall_not_pass_easy/solution.c Normal file
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@ -0,0 +1,12 @@
#include <stdlib.h>
int solution()
{
// return the right answer here
srand(0);
int a = 0;
int b = 1000;
int result = rand() % (b - a) + a;
srand(0);
return result;
}

42
6kyu/consecutive_strings/solution.java Normal file
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class LongestConsec {
public static String longestConsec(String[] strarr, int k) {
int n = strarr.length;
// handle limits
if (n == 0 || k <= 0 || k > n) {
return "";
}
// determine lengths
int[] lengths = new int[n];
for (int i = 0; i < n; i++) {
lengths[i] = strarr[i].length();
}
// calculate first index
int maxIndex = 0, maxLength = 0;
for (int i = 0; i < k; i++) {
maxLength += lengths[i];
}
// Check rest of the array
int tmpLength = maxLength;
for (int i = 1; i < n - k + 1; i++) {
tmpLength += lengths[i + k - 1];
tmpLength -= lengths[i - 1];
if (tmpLength > maxLength) {
maxIndex = i;
maxLength = tmpLength;
}
}
// Join the strings
String result = "";
for (int i = maxIndex; i < maxIndex + k; i++) {
result += strarr[i];
}
return result;
}
}

13
6kyu/convert_string_to_camel_case/solution.js Normal file
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function toCamelCase(str){
if (str.indexOf('-') != -1) {
str = str.split('-');
} else {
str = str.split('_');
}
for (let i = 1; i < str.length; i++) {
str[i] = str[i].charAt(0).toUpperCase() + str[i].substring(1);
}
return str.join('');
}

17
6kyu/count_the_smiley_faces/solution.cs Normal file
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using System.Text.RegularExpressions;
public static class Kata
{
public static int CountSmileys(string[] smileys)
{
var count = 0;
var regex = new Regex(@"[:;][-~]?[D\)]");
foreach (string smiley in smileys) {
if (regex.Match(smiley).Success) count++;
}
return count;
}
}

24
6kyu/counting_duplicates/solution.rs Normal file
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@ -0,0 +1,24 @@
use std::collections::HashMap;
fn count_duplicates(text: &str) -> u32 {
let mut counts: HashMap<char, i32> = HashMap::new();
for character in text.to_lowercase().chars() {
match counts.get_mut(&character) {
None => {
counts.insert(character, 1);
{}
},
Some(x) => *x += 1
}
}
counts
.iter()
.fold(0, |total, (_, &count)|
match count > 1 {
true => total + 1,
_ => total
}
)
}

12
6kyu/create_phone_number/solution.js Normal file
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@ -0,0 +1,12 @@
function createPhoneNumber(numbers) {
let result = '(';
for (let i = 0; i < 10; i++) {
result += numbers[i];
if (i == 2) {
result += ') ';
} else if (i == 5) {
result += '-';
}
}
return result;
}

18
6kyu/decode_the_morse_code/solution.rs Normal file
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mod preloaded;
use preloaded::MORSE_CODE;
// MORSE_CODE is `HashMap<String, String>`. e.g. ".-" -> "A".
fn decode_morse(encoded: &str) -> String {
let mut result = String::new();
encoded.split(" ").map(|x| x.trim()).for_each(|x| {
x.split_whitespace().for_each(|c| {
result += MORSE_CODE.get(c).unwrap();
});
result += " ";
});
String::from(result.trim())
}

17
6kyu/delete_occurrences_if_occurs/solution.js Normal file
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@ -0,0 +1,17 @@
function deleteNth(arr, n) {
const freqs = {};
const result = [];
for (const element of arr) {
if (!freqs[element]) {
freqs[element] = 1;
} else if (freqs[element] < n) {
freqs[element]++;
} else {
continue;
}
result.push(element);
}
return result;
}

36
6kyu/design_a_simple_automaton/solution.cpp Normal file
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@ -0,0 +1,36 @@
#include <map>
#include <set>
class Automaton
{
std::set<int> F{2};
const int initial_state = 1;
std::map<int, std::map<char, int>> transitions{
{1, std::map<char, int>{
{'0', 1}, {'1', 2}
}
},
{2, std::map<char, int>{
{'0', 3}, {'1', 2}
}
},
{3, std::map<char, int>{
{'0', 2}, {'1', 2}
}
}
};
public:
Automaton() {}
bool read_commands(const std::vector<char>& commands) {
int state = initial_state;
for (const char c : commands) {
state = transitions[state][c];
}
return F.find(state) != F.end();
}
};

19
6kyu/does_my_number_look_big_in_this/solution.cs Normal file
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using System;
public class Kata {
public static bool Narcissistic(int value) {
var narcissistic = 0;
var length = (int) Math.Log10(value + 0.5) + 1;
var copyOfValue = value;
while (copyOfValue > 0) {
narcissistic += (int) Math.Pow(copyOfValue % 10, length);
copyOfValue /= 10;
if (narcissistic > value) {
return false;
}
}
return narcissistic == value;
}
}

15
6kyu/duplicate_encoder/solution.java Normal file
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@ -0,0 +1,15 @@
public class DuplicateEncoder {
static String encode(String word) {
word = word.toLowerCase();
String result = "";
for (int i = 0; i < word.length(); i++) {
char character = word.charAt(i);
if (word.indexOf(character) != word.lastIndexOf(character)) {
result += ")";
} else {
result += "(";
}
}
return result;
}
}

23
6kyu/equal_sides_of_an_array/solution.cs Normal file
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@ -0,0 +1,23 @@
public class Kata
{
public static int SumOfTheArray(int[] arr)
{
int sum = 0;
for (int i = 0, max = arr.Length; i < max; sum += arr[i++]);
return sum;
}
public static int FindEvenIndex(int[] arr)
{
int left, right;
left = 0;
right = SumOfTheArray(arr) - arr[0];
for (int i = 1, max = arr.Length; i < max; i++)
{
left += arr[i - 1];
right -= arr[i];
if (left == right) return i;
}
return -1;
}
}

17
6kyu/esolang_interpreters_i/solution.swift Normal file
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@ -0,0 +1,17 @@
func interpreter(_ prog: String) -> String {
var cell = 0
var result = ""
for i in prog {
switch i {
case "+":
cell = (cell + 1) % 256
case ".":
result += String(Character(Unicode.Scalar(cell)!))
default:
break
}
}
return result
}

12
6kyu/evil_autocorrect_prank/solution.js Normal file
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@ -0,0 +1,12 @@
const REGEX = new RegExp("(^|[^a-z]+)(u|you+)($|[^a-z]+)", "gi")
function autocorrect(input){
var result = input;
do {
input = result;
result = result.replace(REGEX, "$1your sister$3");
} while (result != input);
return result;
}

19
6kyu/fat_fingers/solution.py Normal file
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@ -0,0 +1,19 @@
def fat_fingers(string):
if string == "":
return ""
result = ""
caps = False
for letter in string[0:]:
if letter == 'A' or letter == 'a':
caps = not caps
elif caps:
if letter.isupper():
result += letter.lower()
else:
result += letter.upper()
else:
result += letter
return result

12
6kyu/find_the_missing_letter/solution.java Normal file
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@ -0,0 +1,12 @@
public class Kata {
public static char findMissingLetter(char[] array) {
int last = (int)array[0];
for (int i = 1; i < array.length; i++)
if ((int)array[i] != last + 1) {
return (char) (last + 1);
} else {
last++;
}
return (char) -1;
}
}

17
6kyu/find_the_missing_term_in_arith_prog/solution.py Normal file
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@ -0,0 +1,17 @@
def find_missing(sequence):
# Relation => a_n - a_(n-1) = d
diffs = []
for i in range(len(sequence) - 1):
diffs.append(sequence[i + 1] - sequence[i])
max_diff = diffs[0]
for index, diff in enumerate(diffs[1:], 1):
if abs(diff) > abs(max_diff):
return sequence[index] + max_diff
elif abs(max_diff) > abs(diff):
return sequence[0] + diff
raise ValueError()

28
6kyu/find_the_odd_int/solution.cs Normal file
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@ -0,0 +1,28 @@
using System;
namespace Solution
{
class Kata
{
public static int find_it(int[] seq)
{
Array.Sort(seq);
int count = 1;
for (int i = 1; i < seq.Length; i++)
{
if (seq[i] == seq[i - 1]) count++;
else
{
if (count % 2 == 1) return seq[i - 1];
else count = 1;
}
}
if (count % 2 == 1) return seq[seq.Length - 1];
return -1;
}
}
}

16
6kyu/find_the_unique_number/solution.py Normal file
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@ -0,0 +1,16 @@
def find_uniq(arr):
a = arr[0]
count_a = 1
b = None
count_b = 0
for e in arr[1:]:
if e != a:
count_b += 1
b = e
else:
count_a += 1
if count_a < count_b:
return a
else:
return b

23
6kyu/give_me_a_diamond/solution.swift Normal file
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@ -0,0 +1,23 @@
func diamond(_ size: Int) -> String? {
if size < 0 || size % 2 == 0 {
return nil
}
var result = ""
var (count, diff) = (1, 2)
while count > 0 {
print(count, diff)
result += String(repeating: " ", count: (size - count) / 2)
result += String(repeating: "*", count: count)
result += "\n"
if count == size {
diff = -2
}
count += diff
}
return result
}

27
6kyu/halloween_trick_or_treat/solution.js Normal file
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@ -0,0 +1,27 @@
function trickOrTreat(children,candies){
if (candies.length != children) {
return "Trick or treat!";
}
let lastCount = -1;
for (let packet of candies) {
let count = 0;
for (let e of packet) {
if (e == "bomb") {
return "Trick or treat!";
} else if (e == "candy") {
count++;
}
}
if (lastCount == -1) {
lastCount = count;
}
if (count < 2 || lastCount != count) {
return "Trick or treat!";
}
}
return "Thank you, strange uncle!";
}

35
6kyu/help_the_bookseller/solution.rs Normal file
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@ -0,0 +1,35 @@
use std::collections::HashMap;
fn stock_list(list_art: Vec<&str>, list_cat: Vec<&str>) -> String {
if list_art.is_empty() || list_cat.is_empty() {
return "".to_string();
}
let mut map: HashMap<&str, i32> = HashMap::new();
// Initialize with zero values
for cat in &list_cat {
map.insert(cat, 0);
}
// Iterate through art
for art in &list_art {
for cat in &list_cat {
if art.starts_with(cat) {
let v: Vec<&str> = art.split_terminator(' ').collect();
let count: i32 = v[1].parse().unwrap();
map.insert(cat, map[cat] + count);
}
}
}
// Get result string
list_cat
.iter()
.map(
|category| format!("({} : {})", category, map[category])
)
.collect::<Vec<String>>()
.as_slice()
.join(" - ")
}

13
6kyu/highest_scoring_word/solution.py Normal file
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@ -0,0 +1,13 @@
from functools import reduce
def high(x):
x = x.split()
h = reduce(lambda total, char: total + ord(char) - 96, x[0], 0)
hw = x[0]
for word in x[1:]:
total = reduce(lambda total, char: total + ord(char) - 96, word, 0)
if total > h:
h = total
hw = word
return hw

21
6kyu/ip_validation/solution.c Normal file
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@ -0,0 +1,21 @@
#include <stdio.h>
int is_valid_ip(const char * addr) {
int seg[4];
if (sscanf(addr, "%d.%d.%d.%d", &seg[0], &seg[1], &seg[2], &seg[3]) != 4) return 0;
for (size_t i = 0; i < 4; i++) if (seg[i] <= 0 || seg[i] > 255) return 0;
int count = 0;
for (size_t i = 0; addr[i] != '\0'; i++)
{
if (addr[i] == '.') count++;
if ((addr[i] == '.' && addr[i + 1] == '0') || addr[i] == ' ') return 0;
}
if (count != 3) return 0;
return 1;
}

28
6kyu/irreducible_sum_of_rationals/solution.rs Normal file
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@ -0,0 +1,28 @@
fn gcd(mut a: i64, mut b: i64) -> i64 {
while b != 0 {
let t = b;
b = a % b;
a = t;
}
a
}
fn lcm(a: i64, b: i64) -> i64 {
(a*b).abs() / gcd(a, b)
}
fn sum_fracts(l: Vec<(i64, i64)>) -> Option<(i64, i64)> {
if l.is_empty() {
return None;
}
let denom = l.iter().fold(1, |a, b| lcm(a, b.1));
let (num, den) = l.iter().fold((0, denom), |runner, frac|
(runner.0 + (frac.0 * denom / frac.1), denom)
);
let divisor = gcd(num, den);
Some((num / divisor, den / divisor))
}

16
6kyu/is_a_number_prime/solution.py Normal file
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@ -0,0 +1,16 @@
import math
def is_prime(num):
if num <= 1:
return False
elif num == 2:
return True
elif num % 2 == 0:
return False
bound = int(math.ceil(math.sqrt(num)))
for div in range(3, bound + 1, 2):
if num % div == 0:
return False
return True

21
6kyu/length_of_missing_array/solution.cs Normal file
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@ -0,0 +1,21 @@
using System.Collections.Generic;
using System.Linq;
public class Kata {
public static int GetLengthOfMissingArray(object[][] arrayOfArrays) {
if (arrayOfArrays == null || arrayOfArrays.GetLength(0) < 2) return 0;
var lengths = new HashSet<int>();
foreach (var array in arrayOfArrays) {
if (array == null) return 0;
var size = array.GetLength(0);
if (size == 0) return 0;
else lengths.Add(size);
}
var max = lengths.Max();
var min = lengths.Min();
return (int) (0.5 * (arrayOfArrays.GetLength(0) + 1) * (max + min) - lengths.Sum());
}
}

28
6kyu/linked_lists_length_count/solution.cpp Normal file
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@ -0,0 +1,28 @@
/* Node Definition
struct Node {
Node * next;
int data;
}
*/
int Length(Node *head)
{
int count = 0;
while (head != NULL) {
count++;
head = head->next;
}
return count;
}
int Count(Node *head, int data)
{
int count = 0;
while (head != NULL) {
if (head->data == data) count++;
head = head->next;
}
return count;
}

55
6kyu/lotto_6_aus_49/solution.cs Normal file
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@ -0,0 +1,55 @@
using System;
using System.Linq;
public class LOTTO {
private static Random r = new Random();
public static int[] NumberGenerator() {
var result = new int[7];
result[6] = 50;
for (var i = 0; i < 6; i++) {
var number = 0;
do {
number = r.Next(1, 50);
} while (result.Contains(number));
result[i] = number;
}
Array.Sort(result);
result[6] = r.Next(0, 10);
return result;
}
public static int CheckForWinningCategory(int[] checkCombination, int[] winningCombination) {
var count = 0;
var superzahl = checkCombination.Last() == winningCombination.Last();
for (var i = 0; i < 6; i++) {
var index = Array.IndexOf(checkCombination, winningCombination[i]);
if (index != -1 && index != 6) count++;
}
var result = -1;
switch (count) {
case 6:
result = 2;
break;
case 5:
result = 4;
break;
case 4:
result = 6;
break;
case 3:
result = 8;
break;
}
if (count == 2 && superzahl) result = 9;
else if (superzahl && result != -1) result--;
return result;
}
}

10
6kyu/make_the_deadfish_swim/solution.hs Normal file
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@ -0,0 +1,10 @@
module Kata.Deadfish (parse) where
parse :: String -> [Int]
parse = snd . foldl exec (0, [])
where exec (value, output) cmd = case cmd of
'i' -> (value + 1, output)
'd' -> (value - 1, output)
's' -> (value * value, output)
'o' -> (value, output ++ [value])
_ -> (value, output)

7
6kyu/multiples_of_3_or_5/solution.hs Normal file
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@ -0,0 +1,7 @@
module MultiplesOf3And5 where
sumOfMultiples :: Integer -> Integer -> Integer
sumOfMultiples n upTo = div ((div (upTo - 1) n) * (n + (upTo - 1 - mod (upTo - 1) n))) 2
solution :: Integer -> Integer
solution number = sumOfMultiples 3 number + sumOfMultiples 5 number - sumOfMultiples 15 number

16
6kyu/multiplication_table/solution.go Normal file
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@ -0,0 +1,16 @@
package multiplicationtable
func MultiplicationTable(size int) [][]int {
result := make([][]int, size);
for i := 0; i < size; i++ {
result[i] = make([]int, size);
}
for i := 0; i < size; i++ {
for j := 0; j < size; j++ {
result[i][j] = (i + 1) * (j + 1);
}
}
return result;
}

20
6kyu/parabolic_arc_length/solution.rs Normal file
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@ -0,0 +1,20 @@
fn len_curve_of<F>(f: F, from: f64, to: f64, n: i32) -> f64
where
F: Fn(f64) -> f64,
{
let dx = (to - from) / n as f64;
let dx2 = dx * dx;
(0..n)
.map(|i| {
let left = f(from + i as f64 * dx);
let right = f(from + (i + 1) as f64 * dx);
(dx2 + (left - right).abs().powf(2.0)).sqrt()
})
.sum()
}
pub fn len_curve(n: i32) -> f64 {
len_curve_of(|x| x * x, 0.0, 1.0, n)
}

7
6kyu/pascals_triangle/solution.hs Normal file
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@ -0,0 +1,7 @@
module Codewars.Kata.PascalsTriangle where
pascalsRow :: Int -> [Int]
pascalsRow n = scanl (\nCk k -> (nCk * (n - k)) `div` (k + 1)) 1 [0..n - 1]
pascalsTriangle :: Int -> [Int]
pascalsTriangle n = concatMap pascalsRow [0..n - 1]

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