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Find the Index of the First Occurrence in a String

Explore how to find the first occurrence index of a substring within another string using the sliding window method. Understand how this approach applies to common string matching problems in coding interviews and practice implementing efficient solutions for substring search.

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 ...