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"title": "Count Complete Substrings",
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"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> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "igigee", 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 = "aaabbbccc", 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> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= word.length <= 10<sup>5</sup></code></li>\n\t<li><code>word</code> consists only of lowercase English letters.</li>\n\t<li><code>1 <= k <= word.length</code></li>\n</ul>\n",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n int countCompleteSubstrings(string word, int k) {\n \n }\n};",
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"code": "class Solution(object):\n def countCompleteSubstrings(self, word, k):\n \"\"\"\n :type word: str\n :type k: int\n :rtype: int\n \"\"\"\n ",
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"code": "defmodule Solution do\n @spec count_complete_substrings(word :: String.t, k :: integer) :: integer\n def count_complete_substrings(word, k) do\n \n end\nend",
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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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"sampleTestCase": "\"igigee\"\n2",
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