mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
204 lines
17 KiB
JSON
204 lines
17 KiB
JSON
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"title": "Permutation in String",
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"content": "<p>Given two strings <code>s1</code> and <code>s2</code>, return <code>true</code><em> if </em><code>s2</code><em> contains a permutation of </em><code>s1</code><em>, or </em><code>false</code><em> otherwise</em>.</p>\n\n<p>In other words, return <code>true</code> if one of <code>s1</code>'s permutations is the substring of <code>s2</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s1 = "ab", s2 = "eidbaooo"\n<strong>Output:</strong> true\n<strong>Explanation:</strong> s2 contains one permutation of s1 ("ba").\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s1 = "ab", s2 = "eidboaoo"\n<strong>Output:</strong> false\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s1.length, s2.length <= 10<sup>4</sup></code></li>\n\t<li><code>s1</code> and <code>s2</code> consist of lowercase English letters.</li>\n</ul>\n",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec check_inclusion(S1 :: unicode:unicode_binary(), S2 :: unicode:unicode_binary()) -> boolean().\ncheck_inclusion(S1, S2) ->\n .",
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"code": "defmodule Solution do\n @spec check_inclusion(s1 :: String.t, s2 :: String.t) :: boolean\n def check_inclusion(s1, s2) do\n \n end\nend",
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"hints": [
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"Obviously, brute force will result in TLE. Think of something else.",
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"How will you check whether one string is a permutation of another string?",
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"One way is to sort the string and then compare. But, Is there a better way?",
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"If one string is a permutation of another string then they must one common metric. What is that?",
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"Both strings must have same character frequencies, if one is permutation of another. Which data structure should be used to store frequencies?",
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"What about hash table? An array of size 26?"
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],
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