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{
"data": {
"question": {
"questionId": "3223",
"questionFrontendId": "2953",
"categoryTitle": "Algorithms",
"boundTopicId": 2548987,
"title": "Count Complete Substrings",
"titleSlug": "count-complete-substrings",
"content": "<p>You are given a string <code>word</code> and an integer <code>k</code>.</p>\n\n<p>A substring <code>s</code> of <code>word</code> is <strong>complete</strong> if:</p>\n\n<ul>\n\t<li>Each character in <code>s</code> occurs <strong>exactly</strong> <code>k</code> times.</li>\n\t<li>The difference between two adjacent characters is <strong>at most</strong> <code>2</code>. That is, for any two adjacent characters <code>c1</code> and <code>c2</code> in <code>s</code>, the absolute difference in their positions in the alphabet is <strong>at most</strong> <code>2</code>.</li>\n</ul>\n\n<p>Return <em>the number of <strong>complete </strong>substrings of</em> <code>word</code>.</p>\n\n<p>A <strong>substring</strong> is a <strong>non-empty</strong> contiguous sequence of characters in a string.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = &quot;igigee&quot;, k = 2\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The complete substrings where each character appears exactly twice and the difference between adjacent characters is at most 2 are: <u><strong>igig</strong></u>ee, igig<u><strong>ee</strong></u>, <u><strong>igigee</strong></u>.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = &quot;aaabbbccc&quot;, k = 3\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The complete substrings where each character appears exactly three times and the difference between adjacent characters is at most 2 are: <strong><u>aaa</u></strong>bbbccc, aaa<u><strong>bbb</strong></u>ccc, aaabbb<u><strong>ccc</strong></u>, <strong><u>aaabbb</u></strong>ccc, aaa<u><strong>bbbccc</strong></u>, <u><strong>aaabbbccc</strong></u>.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= word.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>word</code> consists only of lowercase English letters.</li>\n\t<li><code>1 &lt;= k &lt;= word.length</code></li>\n</ul>\n",
"translatedTitle": "统计完全子字符串",
"translatedContent": "<p>给你一个字符串&nbsp;<code>word</code>&nbsp;和一个整数 <code>k</code>&nbsp;。</p>\n\n<p>如果&nbsp;<code>word</code>&nbsp;的一个子字符串 <code>s</code>&nbsp;满足以下条件,我们称它是 <strong>完全字符串:</strong></p>\n\n<ul>\n\t<li><code>s</code>&nbsp;中每个字符 <strong>恰好</strong>&nbsp;出现 <code>k</code>&nbsp;次。</li>\n\t<li>相邻字符在字母表中的顺序 <strong>至多</strong>&nbsp;相差&nbsp;<code>2</code>&nbsp;。也就是说,<code>s</code>&nbsp;中两个相邻字符&nbsp;<code>c1</code> 和&nbsp;<code>c2</code>&nbsp;,它们在字母表中的位置相差<strong>&nbsp;至多</strong>&nbsp;为 <code>2</code> 。</li>\n</ul>\n\n<p>请你返回 <code>word</code>&nbsp;中 <strong>完全</strong>&nbsp;子字符串的数目。</p>\n\n<p><strong>子字符串</strong>&nbsp;指的是一个字符串中一段连续 <strong>非空</strong>&nbsp;的字符序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1</strong></p>\n\n<pre>\n<b>输入:</b>word = \"igigee\", k = 2\n<b>输出:</b>3\n<b>解释:</b>完全子字符串需要满足每个字符恰好出现 2 次,且相邻字符相差至多为 2 <em><strong>igig</strong></em>ee, igig<strong style=\"font-style: italic;\">ee</strong>, <em><strong>igigee</strong>&nbsp;。</em>\n</pre>\n\n<p><strong class=\"example\">示例 2</strong></p>\n\n<pre>\n<b>输入:</b>word = \"aaabbbccc\", k = 3\n<b>输出:</b>6\n<b>解释:</b>完全子字符串需要满足每个字符恰好出现 3 次,且相邻字符相差至多为 2 <em><strong>aaa</strong></em>bbbccc, aaa<em><strong>bbb</strong></em>ccc, aaabbb<em><strong>ccc</strong></em>, <em><strong>aaabbb</strong></em>ccc, aaa<em><strong>bbbccc</strong></em>, <em><strong>aaabbbccc </strong></em>。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= word.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>word</code>&nbsp;只包含小写英文字母。</li>\n\t<li><code>1 &lt;= k &lt;= word.length</code></li>\n</ul>\n",
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"hints": [
"There are at most 26 different lengths of the complete substrings: <code>k *1, k * 2, … k * 26</code>.****",
"For each length, we can use sliding window to count the frequency of each letter in the window.",
"We still need to check for all characters in the window that <code>abs(word[i] - word[i - 1]) <= 2</code>. We do this by maintaining the values of <code>abs(word[i] - word[i - 1])</code> in the sliding window dynamically in an ordered multiset or priority queue, so that we know the maximum value at each iteration."
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