leetcode/0567_permutation-in-string/README.md

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Markdown

Given two strings `s1` and `s2`, return `true` _if_ `s2` _contains a permutation of_ `s1`_, or_ `false` _otherwise_.
In other words, return `true` if one of `s1`'s permutations is the substring of `s2`.
**Example 1:**
Input: s1 = "ab", s2 = "eidbaooo"
Output: true
Explanation: s2 contains one permutation of s1 ("ba").
**Example 2:**
Input: s1 = "ab", s2 = "eidboaoo"
Output: false
**Constraints:**
* `1 <= s1.length, s2.length <= 104`
* `s1` and `s2` consist of lowercase English letters.
https://leetcode.com/problems/permutation-in-string