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Problem: Permutation in String

Explore how to identify if one string contains a substring that is a permutation of another by applying a sliding window technique and character frequency comparison in C#. Understand how this approach optimizes checks for anagrams with linear time and constant space complexity.

Statement

Given two strings s1 and s2, determine whether s2 contains any permutation of s1 as a substring. Return true if such a substring exists, and false otherwise.

Note: A permutation of a string is any rearrangement of its characters. You need to check whether any contiguous substring of s2 is an anagram of s1.

Constraints:

  • 11 \leq s1.Length, s2.Length 104\leq 10^4 ...