mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
16 KiB
JSON
174 lines
16 KiB
JSON
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"questionId": "1460",
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"questionFrontendId": "1358",
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"boundTopicId": null,
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"title": "Number of Substrings Containing All Three Characters",
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"content": "<p>Given a string <code>s</code> consisting only of characters <em>a</em>, <em>b</em> and <em>c</em>.</p>\n\n<p>Return the number of substrings containing <b>at least</b> one occurrence of all these characters <em>a</em>, <em>b</em> and <em>c</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abcabc"\n<strong>Output:</strong> 10\n<strong>Explanation:</strong> The substrings containing at least one occurrence of the characters <em>a</em>, <em>b</em> and <em>c are "</em>abc<em>", "</em>abca<em>", "</em>abcab<em>", "</em>abcabc<em>", "</em>bca<em>", "</em>bcab<em>", "</em>bcabc<em>", "</em>cab<em>", "</em>cabc<em>" </em>and<em> "</em>abc<em>" </em>(<strong>again</strong>)<em>. </em>\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "aaacb"\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The substrings containing at least one occurrence of the characters <em>a</em>, <em>b</em> and <em>c are "</em>aaacb<em>", "</em>aacb<em>" </em>and<em> "</em>acb<em>".</em><em> </em>\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abc"\n<strong>Output:</strong> 1\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 <= s.length <= 5 x 10^4</code></li>\n\t<li><code>s</code> only consists of <em>a</em>, <em>b</em> or <em>c </em>characters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abcabc\"\n\"aaacb\"\n\"abc\"",
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"code": "-spec number_of_substrings(S :: unicode:unicode_binary()) -> integer().\nnumber_of_substrings(S) ->\n .",
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"code": "defmodule Solution do\n @spec number_of_substrings(s :: String.t) :: integer\n def number_of_substrings(s) do\n\n end\nend",
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"hints": [
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"For each position we simply need to find the first occurrence of a/b/c on or after this position.",
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"So we can pre-compute three link-list of indices of each a, b, and c."
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],
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"sampleTestCase": "\"abcabc\"",
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