269. Permutation in String

MediumSliding Window

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 a substring of s2.

Examples

Input: ab eidbaooo

Output: true

Explanation: The window 'ba' at index 3 is a permutation of 'ab'.

Constraints

  • 1 <= s1.length, s2.length <= 10^4
  • s1 and s2 consist of lowercase English letters.
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