mfocko/LeetCode
mfocko/LeetCode
1
0
Fork 0
Code Issues Pull requests Wiki Activity
LeetCode/problems
History
Matej Focko 227124b327
problems(cs): add „637. Average of Levels in Binary Tree“ 
Signed-off-by: Matej Focko <mfocko@redhat.com>

diff --git a/problems/average-of-levels-in-binary-tree.cs b/problems/average-of-levels-in-binary-tree.cs
new file mode 100644
index 0000000..f2ba5aa
--- /dev/null
+++ b/problems/average-of-levels-in-binary-tree.cs
@@ -0,0 +1,72 @@
+public class TreeNode
+{
+    public int val;
+    public TreeNode? left;
+    public TreeNode? right;
+    public TreeNode(int val = 0, TreeNode? left = null, TreeNode? right = null)
+    {
+        this.val = val;
+        this.left = left;
+        this.right = right;
+    }
+}
+
+
+public class Solution
+{
+    private class Level
+    {
+        long sum;
+        int counter;
+
+        public Level()
+        {
+            sum = 0;
+            counter = 0;
+        }
+
+        public void Add(int x)
+        {
+            sum += x;
+            counter++;
+        }
+
+        public double Average
+        {
+            get => sum / (double)counter;
+        }
+    }
+
+    private List<Level> AverageOfLevels(List<Level> averages, TreeNode? node, int level)
+    {
+        if (node == null)
+        {
+            return averages;
+        }
+
+        if (level == averages.Count)
+        {
+            averages.Add(new Level());
+        }
+        averages[level].Add(node.val);
+
+        AverageOfLevels(averages, node.left, level + 1);
+        AverageOfLevels(averages, node.right, level + 1);
+
+        return averages;
+    }
+
+    public IList<double> AverageOfLevels(TreeNode? root)
+        => AverageOfLevels(new List<Level>(), root, 0).Select(level => level.Average).ToList();
+
+    public static void Main()
+    {
+        var s = new Solution();
+
+        foreach (var a in s.AverageOfLevels(new TreeNode(3, new TreeNode(9), new TreeNode(20, new TreeNode(15), new TreeNode(7)))))
+        {
+            Console.Write($"{a} ");
+        }
+        Console.WriteLine();
+    }
+}
2022-09-02 21:11:03 +02:00
..
average-of-levels-in-binary-tree.cs problems(cs): add „637. Average of Levels in Binary Tree“ 2022-09-02 21:11:03 +02:00
binary-search-tree-iterator.java problems: add BST iterator 2022-08-04 23:11:25 +02:00
binary-search.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
binary-tree-inorder-traversal.kt problems: add inorder bst traversal 2022-01-18 16:17:04 +01:00
binary-tree-level-order-traversal.kt problems: add binary tree level-order traversal 2022-07-13 22:13:48 +00:00
binary-trees-with-factors.rs problems: add „823. Binary Trees With Factors“ 2022-08-09 12:14:37 +02:00
can-place-flowers.cpp chore: format sources 2022-07-23 13:12:05 +02:00
climbing-stairs.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
combination-sum-iv.java problems: add combination sum IV 2022-08-05 11:06:37 +02:00
complex-number-multiplication.rs problems: add previously solved problems 2022-01-18 21:43:49 +01:00
contains-duplicate.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
contains-duplicate.swift chore: reorganize files 2022-07-23 12:53:31 +02:00
convert-sorted-array-to-binary-search-tree.java problems: add „108. Convert Sorted Array to Binary Search Tree“ 2022-08-10 20:58:57 +02:00
count-vowels-permutation.rs problems: add count vowels permutation 2022-08-07 12:39:11 +02:00
divide-a-string-into-groups-of-size-k.cpp chore: reorganize files 2022-07-23 12:53:31 +02:00
fibonacci-number.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
find-pivot-index.rs problems: add find pivot index 2022-07-12 12:36:28 +00:00
first-bad-version.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
first-unique-character-in-a-string.kt problems: add „387. First Unique Character in a String“ 2022-08-16 11:10:52 +02:00
flatten-nested-list-iterator.java fix: correct the comments and interface 2022-08-05 16:52:51 +02:00
insert-into-a-binary-search-tree.rb problems: add insert-into-a-bst 2022-01-12 20:10:00 +01:00
iterator-for-combination.kt problems: add „1286. Iterator for Combination“ 2022-08-09 15:14:12 +02:00
kth-smallest-element-in-a-sorted-matrix.cpp problems: add kth smallest element in a sorted matrix 2022-08-02 22:46:54 +02:00
linked-list-cycle-ii.rb problems: add daily problems 2022-01-19 12:19:22 +01:00
longest-increasing-subsequence.rs problems: add „Longest Increasing Subsequence“ 2022-08-08 21:58:30 +02:00
lowest-common-ancestor-of-a-binary-search-tree.kt problems: add „235. Lowest Common Ancestor of a Binary Search Tree“ 2022-08-12 22:10:33 +02:00
max-area-of-island.kt problems: add max area of island 2022-07-16 14:31:55 +00:00
max-sum-of-rectangle-no-larger-than-k.cpp problems(cpp): add „363. Max Sum of Rectangle No Larger Than K“ 2022-08-28 23:31:42 +02:00
maximize-distance-to-closest-person.kt problems: add maximize distance to closest 2022-01-16 12:42:13 +01:00
maximum-number-of-coins-you-can-get.rs problems: add maximum numbers of coins you can get 2022-07-12 15:35:23 +00:00
maximum-running-time-of-n-computers.cpp chore: reorganize files 2022-07-23 12:53:31 +02:00
maximum-subarray.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
maximum-units-on-a-truck.kt problems: add maximum units on a truck 2022-07-14 13:28:35 +00:00
merge-sorted-array.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
middle-of-the-linked-list.cpp chore: format sources 2022-07-23 13:12:05 +02:00
min-cost-climbing-stairs.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
minimum-moves-to-reach-target-score.cpp chore: reorganize files 2022-07-23 12:53:31 +02:00
minimum-number-of-refueling-stops.kt problems: add „871. Minimum Number of Refueling Stops“ 2022-08-20 18:30:43 +02:00
mirror-reflection.cpp problems: add mirror reflection 2022-08-04 21:35:42 +02:00
my-calendar-i.cpp problems: add my calendar I 2022-08-03 19:30:14 +02:00
n-ary-tree-level-order-traversal.cpp problems: add n-ary tree level-order traversal 2022-07-23 13:10:25 +02:00
n-ary-tree-preorder-traversal.cpp problems: add n-ary tree preorder traversal 2022-07-23 13:11:02 +02:00
number-complement.swift problems: add previously solved problems 2022-01-18 21:43:49 +01:00
number-of-islands.rs problems(rs): add „200. Number of Islands“ 2022-08-29 19:22:05 +02:00
number-of-matching-subsequences.cpp problems: add number of matching subsequences 2022-07-20 17:09:12 +02:00
out-of-boundary-paths.cpp problems: add out of boundary paths 2022-07-18 17:40:53 +00:00
pacific-atlantic-water-flow.rs problems(rs): add „417. Pacific Atlantic Water Flow“ 2022-09-01 01:01:53 +02:00
palindrome-linked-list.cpp problems(cpp): add „234. Palindrome Linked List“ 2022-08-24 00:04:31 +02:00
partition-list.cpp problems: add partition list 2022-07-22 23:45:16 +02:00
pascals-triangle-ii.cpp problems: add pascals triangle ii 2022-07-19 16:48:05 +02:00
pascals-triangle.cpp problems: add pascals triangle 2022-07-19 16:26:56 +02:00
peeking-iterator.java problems: add peeking iterator 2022-08-05 12:11:01 +02:00
poor-pigs.cs problems: add poor pigs 2022-08-06 20:59:39 +02:00
power-of-four.rs problems(rs): add „342. Power of Four“ 2022-08-22 11:33:45 +02:00
power-of-three.kt problems(kt): add „326. Power of Three“ 2022-08-24 12:35:09 +02:00
ransom-note.cpp problems(cpp): add „383. Ransom Note“ 2022-08-25 14:06:33 +02:00
reduce-array-size-to-the-half.rs problems: add „1338. Reduce Array Size to The Half“ 2022-08-18 09:35:18 +02:00
reordered-power-of-2.cpp problems(cpp): add „869. Reordered Power of 2“ 2022-08-26 23:52:22 +02:00
rle-iterator.java problems: add an RLE Iterator 2022-08-06 17:34:50 +02:00
roman-to-integer.kt problems: add „13. Roman to Integer“ 2022-08-15 09:45:52 +02:00
rotate-array.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
rotate-image.cpp problems(cpp): add „48. Rotate Image“ 2022-09-01 01:01:22 +02:00
running-sum-of-1d-array.rs problems: add running sum of 1D array 2022-07-12 11:32:59 +00:00
search-insert-position.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
solving-questions-with-brainpower.cpp chore: reorganize files 2022-07-23 12:53:31 +02:00
sort-the-matrix-diagonally.cpp problems(cpp): add „1329. Sort the Matrix Diagonally“ 2022-08-28 23:32:10 +02:00
split-array-into-consecutive-subsequences.kt problems: add „659. Split Array into Consecutive Subsequences“ 2022-08-19 22:33:11 +02:00
squares-of-a-sorted-array.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
stamping-the-sequence.rs problems(rs): add „936. Stamping The Sequence“ 2022-08-21 20:19:10 +02:00
substring-with-concatenation-of-all-words.kt problems: add „30. Substring with Concatenation of All Words“ 2022-08-13 22:50:35 +02:00
tribonacci.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
two-sum.rb chore: reorganize files 2022-07-23 12:53:31 +02:00
unique-morse-code-words.kt problems: add „804. Unique Morse Code Words“ 2022-08-17 11:48:21 +02:00
unique-paths.cpp problems: add unique paths 2022-08-02 11:40:31 +02:00
validate-binary-search-tree.kt problems: add „98. Validate Binary Search Tree“ 2022-08-11 10:02:47 +02:00
word-ladder-ii.kt problems: add „126. Word Ladder II“ 2022-08-14 21:19:49 +02:00
word-pattern.rb problems: add daily problems 2022-01-19 12:19:22 +01:00