Web Reference: Oct 24, 2025 · Learn how to solve LeetCode’s Find the Index of the First Occurrence in a String in Java with step-by-step logic, time complexity, and KMP optimization explained clearly. Find the Index of the First Occurrence in a String - Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Your task is to find the first occurrence of the needle string within the haystack string. The problem asks you to return the starting index position where needle first appears as a substring in haystack.
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