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Find the Index of the First Occurrence in a String

Explore how to efficiently find the index of the first occurrence of one string within another using the sliding window approach. Understand the problem constraints, apply the technique, and practice implementing the solution to strengthen your coding interview skills.

Statement

Given two strings haystack and needle, return the index of the first occurrence of needle within haystack. If needle does not exist as a substring of haystack, return 1-1 ...