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Grokking the Coding Interview Patterns in C#

Solution: Find All Anagrams in a String

Explore how to identify all anagrams of a string within another string by tracking character counts with hash maps and a sliding window. This lesson helps you understand efficient string matching techniques, including handling character counts and updating indexes, to solve anagram-related coding problems in C#.

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Statement

Given two strings, a and b, return an array of all the start indexes of anagrams of b in a. We may return the answer in any order.

An anagram is a word or phrase created by rearranging the letters of another word or phrase while utilizing each of the original letters exactly once. For example, “act” is the anagram of “cat”, and “flow” is the anagram of “wolf”.

Constraints:

  • 1≤1\leq a.Length, b.Length ≤3×103\leq 3 \times 10^3
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