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🔥Find All Anagrams in a String: Fixed Frequency WindowMedium
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Find All Anagrams in a String: Fixed Frequency Window

Targeted in FAANG & Tech OA:AmazonGoogleMicrosoft
Real-World Engineering Context
Used in cryptographic frequency analysis attacks, gene sequence motif matching, and plagiarism phrase detectors.
Given two strings `s` and `p`, return an array of all the start indices of `p`'s anagrams in `s`. You may return the answer in any order. An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.

Sample Test Cases

Input: ["cbaebabacd","abc"]
Expected: [0,6]
Input: ["abab","ab"]
Expected: [0,1,2]
Input: ["a","ab"]
Expected: []

Constraints

  • 1 <= s.length, p.length <= 3 * 10^4
  • s and p consist of lowercase English letters.
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