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Find the Index of the First Occurrence in a String

Explore how to efficiently locate the first occurrence index of a substring within a string using the sliding window approach. Understand the problem constraints and implement your solution in a hands-on coding environment designed to build your string manipulation 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 ...