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|
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|
|
<div class="ttypography"><div class="problem-statement"><div class="header"><div class="title">A. Word</div><div class="time-limit"><div class="property-title">time limit per test</div>2 seconds</div><div class="memory-limit"><div class="property-title">memory limit per test</div>256 megabytes</div><div class="input-file"><div class="property-title">input</div>standard input</div><div class="output-file"><div class="property-title">output</div>standard output</div></div><div><p>Vasya is very upset that many people on the Net mix uppercase and lowercase letters in one word. That's why he decided to invent an extension for his favorite browser that would change the letters' register in every word so that it either only consisted of lowercase letters or, vice versa, only of uppercase ones. At that as little as possible letters should be changed in the word. For example, the word <span class="tex-font-style-tt">HoUse</span> must be replaced with <span class="tex-font-style-tt">house</span>, and the word <span class="tex-font-style-tt">ViP</span> — with <span class="tex-font-style-tt">VIP</span>. If a word contains an equal number of uppercase and lowercase letters, you should replace all the letters with lowercase ones. For example, <span class="tex-font-style-tt">maTRIx</span> should be replaced by <span class="tex-font-style-tt">matrix</span>. Your task is to use the given method on one given word.</p></div><div class="input-specification"><div class="section-title">Input</div><p>The first line contains a word <span class="tex-span"><i>s</i></span> — it consists of uppercase and lowercase Latin letters and possesses the length from <span class="tex-span">1</span> to <span class="tex-span">100</span>.</p></div><div class="output-specification"><div class="section-title">Output</div><p>Print the corrected word <span class="tex-span"><i>s</i></span>. If the given word <span class="tex-span"><i>s</i></span> has strictly more uppercase letters, make the word written in the uppercase register, otherwise - in the lowercase one.</p></div><div class="sample-tests"><div class="section-title">Examples</div><div class="sample-test"><div class="input"><div class="title">Input</div><pre>HoUse<br /></pre></div><div class="output"><div class="title">Output</div><pre>house<br /></pre></div><div class="input"><div class="title">Input</div><pre>ViP<br /></pre></div><div class="output"><div class="title">Output</div><pre>VIP<br /></pre></div><div class="input"><div class="title">Input</div><pre>maTRIx<br /></pre></div><div class="output"><div class="title">Output</div><pre>matrix<br /></pre></div></div></div></div></div>
|
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|
|
</div>
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}
|
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const cpyId = ("id" + Math.random()).replaceAll(".", "0");
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const $copy = $("<div title='Copy' data-clipboard-target='#" + preId + "' id='" + cpyId + "' class='input-output-copier'>Copy</div>");
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const clipboard = new Clipboard('#' + cpyId, {
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text: function (trigger) {
|
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const pre = document.querySelector('#' + preId);
|
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return Codeforces.filterClipboardText(pre.innerText, lines.length);
|
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}
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clipboard.on('success', function (e) {
|
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|
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Codeforces.showMessage("The example input has been copied into the clipboard");
|
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} else {
|
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Codeforces.showMessage("The example output has been copied into the clipboard");
|
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}
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|
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|
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|
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$(".test-form-item input").change(function () {
|
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addPendingSubmissionMessage($($(this).closest("form")), "You changed the answer, do not forget to submit it if you want to save the changes");
|
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const index = $(this).closest(".problemindexholder").attr("problemindex");
|
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|
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if (index.length > 0 && test.length > 0) {
|
|||
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const indexTest = index + "::" + test;
|
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window.changedTests.add(indexTest);
|
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}
|
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$(window).on('beforeunload', function () {
|
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if (window.changedTests.size > 0) {
|
|||
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|
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|
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autosize($('.test-explanation textarea'));
|
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$(".test-example-line").hover(function() {
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$(this).attr("class").split(" ").forEach((clazz) => {
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|
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|
|||
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if (end !== "even" && end !== "odd" && end !== "0") {
|
|||
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|
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|
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|
|||
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$(this).closest(".input").find("." + clazz).css("background-color", "#FFFDE7").each(function() {
|
|||
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top = Math.min(top, $(this).offset().top);
|
|||
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left = Math.min(left, $(this).offset().left);
|
|||
|
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|
|||
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let testCaseMarker = problem.find(".testCaseMarker_" + end);
|
|||
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|
|||
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|
const html = "<div class=\"testCaseMarker testCaseMarker_" + end + " notice\"></div>";
|
|||
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problem.append($(html));
|
|||
|
|
testCaseMarker = problem.find(".testCaseMarker_" + end);
|
|||
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|
|||
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|
if (testCaseMarker) {
|
|||
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testCaseMarker.show()
|
|||
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.offset({top, left: left - 20})
|
|||
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.text(end);
|
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|
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|
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}
|
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|
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|
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|
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|||
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|
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|
|||
|
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$("." + clazz).css("background-color", "");
|
|||
|
|
$(this).closest(".problemindexholder").find(".testCaseMarker_" + end).hide();
|
|||
|
|
}
|
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|
|
}
|
|||
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|
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|
|||
|
|
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|
|||
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|
|||
|
|
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|
|||
|
|
</script>
|
|||
|
|
</div>
|
|||
|
|
<div
|
|||
|
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style="margin-bottom: 2em;"
|
|||
|
|
>
|
|||
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|
|||
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|
|||
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|
<div class="problemindexholder" problemindex="B" data-uuid="ps_7b12bf9171131754c303070fd2335579caca1b1f">
|
|||
|
|
<div style="display: none; margin:1em 0;text-align: center; position: relative;" class="alert alert-info diff-notifier">
|
|||
|
|
<div>The problem statement has recently been changed. <a class="view-changes" href="#">View the changes.</a></div>
|
|||
|
|
<span class="diff-notifier-close" style="position: absolute; top: 0.2em; right: 0.3em; cursor: pointer; font-size: 1.4em;">×</span>
|
|||
|
|
</div>
|
|||
|
|
<div class="ttypography"><div class="problem-statement"><div class="header"><div class="title">B. Fortune Telling</div><div class="time-limit"><div class="property-title">time limit per test</div>2 seconds</div><div class="memory-limit"><div class="property-title">memory limit per test</div>256 megabytes</div><div class="input-file"><div class="property-title">input</div>standard input</div><div class="output-file"><div class="property-title">output</div>standard output</div></div><div><p>Marina loves Sasha. But she keeps wondering whether Sasha loves her. Of course, the best way to know it is fortune telling. There are many ways of telling fortune, but Marina has picked the easiest one. She takes in her hand one or several camomiles and tears off the petals one by one. After each petal she pronounces alternatively "Loves" and "Doesn't love", at that Marina always starts with "Loves". There are <span class="tex-span"><i>n</i></span> camomiles growing in the field, possessing the numbers of petals equal to <span class="tex-span"><i>a</i><sub class="lower-index">1</sub>, <i>a</i><sub class="lower-index">2</sub>, ... <i>a</i><sub class="lower-index"><i>n</i></sub></span>. Marina wants to pick a bouquet with the maximal possible total number of petals so that the result would still be "Loves". Help her do that; find the maximal number of petals possible in the bouquet.</p></div><div class="input-specification"><div class="section-title">Input</div><p>The first line contains an integer <span class="tex-span"><i>n</i></span> (<span class="tex-span">1 ≤ <i>n</i> ≤ 100</span>), which is the number of flowers growing in the field. The second line contains <span class="tex-span"><i>n</i></span> integers <span class="tex-span"><i>a</i><sub class="lower-index"><i>i</i></sub></span> (<span class="tex-span">1 ≤ <i>a</i><sub class="lower-index"><i>i</i></sub> ≤ 100</span>) which represent the number of petals on a given <span class="tex-span"><i>i</i></span>-th camomile.</p></div><div class="output-specification"><div class="section-title">Output</div><p>Print a single number which is the maximal number of petals in the bouquet, the fortune telling on which would result in "Loves". If there are no such bouquet, print <span class="tex-span">0</span> instead. The bouquet may consist of a single flower.</p></div><div class="sample-tests"><div class="section-title">Examples</div><div class="sample-test"><div class="input"><div class="title">Input</div><pre>1<br />1<br /></pre></div><div class="output"><div class="title">Output</div><pre>1<br /></pre></div><div class="input"><div class="title">Input</div><pre>1<br />2<br /></pre></div><div class="output"><div class="title">Output</div><pre>0<br /></pre></div><div class="input"><div class="title">Input</div><pre>3<br />5 6 7<br /></pre></div><div class="output"><div class="title">Output</div><pre>13<br /></pre></div></div></div></div></div>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<script>
|
|||
|
|
$(function () {
|
|||
|
|
Codeforces.addMathJaxListener(function () {
|
|||
|
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|
|||
|
|
let uuid = $problem.attr("data-uuid");
|
|||
|
|
let statementText = convertStatementToText($problem.find(".ttypography").get(0));
|
|||
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|
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|
|
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|
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|
|||
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|
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|
|||
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|
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|
|
$problem.find(".diff-notifier-close").click(function() {
|
|||
|
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Codeforces.putToStorageTtl(uuid, statementText, 6 * 60 * 60);
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|||
|
|
$problem.find(".diff-notifier").hide();
|
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|
|
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|
|||
|
|
|
|||
|
|
$problem.find("a.view-changes").click(function() {
|
|||
|
|
$.post("/data/diff", {action: "getDiff", a: previousStatementText, b: statementText}, function (result) {
|
|||
|
|
if (result["success"] === "true") {
|
|||
|
|
Codeforces.facebox(".diff-popup", "//codeforces.org/s/14919");
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|||
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$("#facebox .diff-popup").html(result["diff"]);
|
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|
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|
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Codeforces.putToStorageTtl(uuid, statementText, 6 * 60 * 60);
|
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|
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|
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|
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|
|||
|
|
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|
|||
|
|
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|
|||
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|
|
|||
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|
|||
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|
|||
|
|
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|
|||
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|
|
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|
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function endsWith(string, suffix) {
|
|||
|
|
return string.indexOf(suffix, string.length - suffix.length) !== -1;
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|
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|
|||
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|
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|
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const inputFileDiv = $("div.input-file");
|
|||
|
|
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|
|||
|
|
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|
|||
|
|
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|
|||
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|
|||
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|
|
|||
|
|
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|
|||
|
|
&& !endsWith(inputFile, "standard input")) {
|
|||
|
|
inputFileDiv.attr("style", "font-weight: bold");
|
|||
|
|
}
|
|||
|
|
|
|||
|
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if (!endsWith(outputFile, "standard output")
|
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|
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&& !endsWith(outputFile, "standard output")) {
|
|||
|
|
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|
|||
|
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|
|||
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|
|||
|
|
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|
|||
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|
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|
|||
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|
|||
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|
|||
|
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|
|||
|
|
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|
|||
|
|
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|
|||
|
|
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|
|||
|
|
style="margin-bottom: 2em;"
|
|||
|
|
>
|
|||
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|
|
|||
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|
|||
|
|
<div class="problemindexholder" problemindex="C" data-uuid="ps_201cdf5b2fdb114fc10922563c0f754a9c8aabc0">
|
|||
|
|
<div style="display: none; margin:1em 0;text-align: center; position: relative;" class="alert alert-info diff-notifier">
|
|||
|
|
<div>The problem statement has recently been changed. <a class="view-changes" href="#">View the changes.</a></div>
|
|||
|
|
<span class="diff-notifier-close" style="position: absolute; top: 0.2em; right: 0.3em; cursor: pointer; font-size: 1.4em;">×</span>
|
|||
|
|
</div>
|
|||
|
|
<div class="ttypography"><div class="problem-statement"><div class="header"><div class="title">C. Title</div><div class="time-limit"><div class="property-title">time limit per test</div>2 seconds</div><div class="memory-limit"><div class="property-title">memory limit per test</div>256 megabytes</div><div class="input-file"><div class="property-title">input</div>standard input</div><div class="output-file"><div class="property-title">output</div>standard output</div></div><div><p>Vasya has recently finished writing a book. Now he faces the problem of giving it the title. Vasya wants the title to be vague and mysterious for his book to be noticeable among others. That's why the title should be represented by a single word containing at least once each of the first <span class="tex-span"><i>k</i></span> Latin letters and not containing any other ones. Also, the title should be a palindrome, that is it should be read similarly from the left to the right and from the right to the left.</p><p>Vasya has already composed the approximate variant of the title. You are given the title template <span class="tex-span"><i>s</i></span> consisting of lowercase Latin letters and question marks. Your task is to replace all the question marks by lowercase Latin letters so that the resulting word satisfies the requirements, described above. Each question mark should be replaced by exactly one letter, it is not allowed to delete characters or add new ones to the template. If there are several suitable titles, choose the first in the alphabetical order, for Vasya's book to appear as early as possible in all the catalogues.</p></div><div class="input-specification"><div class="section-title">Input</div><p>The first line contains an integer <span class="tex-span"><i>k</i></span> (<span class="tex-span">1 ≤ <i>k</i> ≤ 26</span>) which is the number of allowed alphabet letters. The second line contains <span class="tex-span"><i>s</i></span> which is the given template. In <span class="tex-span"><i>s</i></span> only the first <span class="tex-span"><i>k</i></span> lowercase letters of Latin alphabet and question marks can be present, the length of <span class="tex-span"><i>s</i></span> is from 1 to 100 characters inclusively.</p></div><div class="output-specification"><div class="section-title">Output</div><p>If there is no solution, print <span class="tex-font-style-tt">IMPOSSIBLE</span>. Otherwise, a single line should contain the required title, satisfying the given template. The title should be a palindrome and it can only contain the first <span class="tex-span"><i>k</i></span> letters of the Latin alphabet. At that, each of those <span class="tex-span"><i>k</i></span> letters must be present at least once. If there are several suitable titles, print the lexicographically minimal one. </p><p>The lexicographical comparison is performed by the standard < operator in modern programming languages. The line <span class="tex-span"><i>a</i></span> is lexicographically smaller than the line <span class="tex-span"><i>b</i></span>, if exists such an <span class="tex-span"><i>i</i></span> (<span class="tex-span">1 ≤ <i>i</i> ≤ |<i>s</i>|</span>), that <span class="tex-span"><i>a</i><sub class="lower-index"><i>i</i></sub> < <i>b</i><sub class="lower-index"><i>i</i></sub></span>, and for any <span class="tex-span"><i>j</i></span> (<span class="tex-span">1 ≤ <i>j</i> < <i>i</i></span>) <span class="tex-span"><i>a</i><sub class="lower-index"><i>j</i></sub> = <i>b</i><sub class="lower-index"><i>j</i></sub></span>. <span class="tex-span">|<i>s</i>|</span> stands for the length of the given template.</p></div><div class="sample-tests"><div class="section-title">Examples</div><div class="sample-test"><div class="input"><div class="title">Input</div><pre>3<br />a?c<br /></pre></div><div class="output"><div class="title">Output</div><pre>IMPOSSIBLE<br /></pre></div><div class="input"><div class="title">Input</div><pre>2<br />a??a<br /></pre></div><div class="output"><div class="title">Output</div><pre>ab
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<script>
|
|||
|
|
$(function () {
|
|||
|
|
Codeforces.addMathJaxListener(function () {
|
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let $problem = $("div[problemindex=C]");
|
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|
|
let statementText = convertStatementToText($problem.find(".ttypography").get(0));
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|
|
let previousStatementText = Codeforces.getFromStorage(uuid);
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|
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|
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|
|
$problem.find("a.view-changes").click(function() {
|
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|
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$.post("/data/diff", {action: "getDiff", a: previousStatementText, b: statementText}, function (result) {
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|
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|
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Codeforces.facebox(".diff-popup", "//codeforces.org/s/14919");
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|
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|
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|
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Codeforces.putToStorageTtl(uuid, statementText, 6 * 60 * 60);
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|
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|
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});
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});
|
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|
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|
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|
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|
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function endsWith(string, suffix) {
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<div class="ttypography"><div class="problem-statement"><div class="header"><div class="title">D. Team Arrangement</div><div class="time-limit"><div class="property-title">time limit per test</div>3 seconds</div><div class="memory-limit"><div class="property-title">memory limit per test</div>256 megabytes</div><div class="input-file"><div class="property-title">input</div>standard input</div><div class="output-file"><div class="property-title">output</div>standard output</div></div><div><p>Recently personal training sessions have finished in the Berland State University Olympiad Programmer Training Centre. By the results of these training sessions teams are composed for the oncoming team contest season. Each team consists of three people. All the students of the Centre possess numbers from <span class="tex-span">1</span> to <span class="tex-span">3<i>n</i></span>, and all the teams possess numbers from <span class="tex-span">1</span> to <span class="tex-span"><i>n</i></span>. The splitting of students into teams is performed in the following manner: while there are people who are not part of a team, a person with the best total score is chosen among them (the captain of a new team), this person chooses for himself two teammates from those who is left according to his list of priorities. The list of every person's priorities is represented as a permutation from <span class="tex-font-style-bf">the rest of</span> <span class="tex-span">3<i>n</i> - 1</span> students who attend the centre, besides himself.</p><p>You are given the results of personal training sessions which are a permutation of numbers from <span class="tex-span">1</span> to <span class="tex-span">3<i>n</i></span>, where the <span class="tex-span"><i>i</i></span>-th number is the number of student who has won the <span class="tex-span"><i>i</i></span>-th place. No two students share a place. You are also given the arrangement of the already formed teams in the order in which they has been created. Your task is to determine the list of priorities for the student number <span class="tex-span"><i>k</i></span>. If there are several priority lists, choose the lexicographically minimal one.</p></div><div class="input-specification"><div class="section-title">Input</div><p>The first line contains an integer <span class="tex-span"><i>n</i></span> (<span class="tex-span">1 ≤ <i>n</i> ≤ 10<sup class="upper-index">5</sup></span>) which is the number of resulting teams. The second line contains <span class="tex-span">3<i>n</i></span> space-separated integers from <span class="tex-span">1</span> to <span class="tex-span">3<i>n</i></span> which are the results of personal training sessions. It is guaranteed that every student appears in the results exactly once.</p><p>Then follow <span class="tex-span"><i>n</i></span> lines each containing three integers from <span class="tex-span">1</span> to <span class="tex-span">3<i>n</i></span> — each line describes the members of a given team. The members of one team can be listed in any order, but the teams themselves are listed in the order in which they were created. It is guaranteed that the arrangement is correct, that is that every student is a member of exactly one team and those teams could really be created from the given results using the method described above.</p><p>The last line contains number <span class="tex-span"><i>k</i></span> (<span class="tex-span">1 ≤ <i>k</i> ≤ 3<i>n</i></span>) which is the number of a student for who the list of priorities should be found.</p></div><div class="output-specification"><div class="section-title">Output</div><p>Print <span class="tex-span">3<i>n</i> - 1</span> numbers — the lexicographically smallest list of priorities for the student number <span class="tex-span"><i>k</i></span>. </p><p>The lexicographical comparison is performed by the standard < operator in modern programming languages. The list <span class="tex-span"><i>a</i></span> is lexicographically less that the list <span class="tex-span"><i>b</i></span> if exists such an <s
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<div class="ttypography"><div class="problem-statement"><div class="header"><div class="title">E. Shortest Path</div><div class="time-limit"><div class="property-title">time limit per test</div>3 seconds</div><div class="memory-limit"><div class="property-title">memory limit per test</div>256 megabytes</div><div class="input-file"><div class="property-title">input</div>standard input</div><div class="output-file"><div class="property-title">output</div>standard output</div></div><div><p>In Ancient Berland there were <span class="tex-span"><i>n</i></span> cities and <span class="tex-span"><i>m</i></span> two-way roads of equal length. The cities are numbered with integers from <span class="tex-span">1</span> to <span class="tex-span"><i>n</i></span> inclusively. According to an ancient superstition, if a traveller visits three cities <span class="tex-span"><i>a</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>b</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>c</i><sub class="lower-index"><i>i</i></sub></span> in row, without visiting other cities between them, a great disaster awaits him. Overall there are <span class="tex-span"><i>k</i></span> such city triplets. Each triplet is ordered, which means that, for example, you are allowed to visit the cities in the following order: <span class="tex-span"><i>a</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>c</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>b</i><sub class="lower-index"><i>i</i></sub></span>. Vasya wants to get from the city <span class="tex-span">1</span> to the city <span class="tex-span"><i>n</i></span> and not fulfil the superstition. Find out which minimal number of roads he should take. Also you are required to find one of his possible path routes.</p></div><div class="input-specification"><div class="section-title">Input</div><p>The first line contains three integers <span class="tex-span"><i>n</i></span>, <span class="tex-span"><i>m</i></span>, <span class="tex-span"><i>k</i></span> (<span class="tex-span">2 ≤ <i>n</i> ≤ 3000, 1 ≤ <i>m</i> ≤ 20000, 0 ≤ <i>k</i> ≤ 10<sup class="upper-index">5</sup></span>) which are the number of cities, the number of roads and the number of the forbidden triplets correspondingly. </p><p>Then follow <span class="tex-span"><i>m</i></span> lines each containing two integers <span class="tex-span"><i>x</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>y</i><sub class="lower-index"><i>i</i></sub></span> (<span class="tex-span">1 ≤ <i>x</i><sub class="lower-index"><i>i</i></sub>, <i>y</i><sub class="lower-index"><i>i</i></sub> ≤ <i>n</i></span>) which are the road descriptions. The road is described by the numbers of the cities it joins. No road joins a city with itself, there cannot be more than one road between a pair of cities. </p><p>Then follow <span class="tex-span"><i>k</i></span> lines each containing three integers <span class="tex-span"><i>a</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>b</i><sub class="lower-index"><i>i</i></sub></span>, <span class="tex-span"><i>c</i><sub class="lower-index"><i>i</i></sub></span> (<span class="tex-span">1 ≤ <i>a</i><sub class="lower-index"><i>i</i></sub>, <i>b</i><sub class="lower-index"><i>i</i></sub>, <i>c</i><sub class="lower-index"><i>i</i></sub> ≤ <i>n</i></span>) which are the forbidden triplets. Each ordered triplet is listed mo more than one time. All three cities in each triplet are distinct.</p><p>City <span class="tex-span"><i>n</i></span> can be unreachable from city <span class="tex-span">1</span> by roads.</p></div><div class="output-specification"><div class="section-title">Output</div><p>If there are no path from <span class="tex-span">1</span> to <span class="tex-span"><i>n</i></span> print <span class="tex-font-style-tt">-1</span>. Otherwise on the first line print the number of roads <span class="tex-span"><i>d</i>
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