Find the Index of the First Occurrence in a String Problem

Find the Index of the First Occurrence in a String Problem — ExecCode Easy DSA Practice

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Problem description

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.

Examples

Input haystack = "sadbutsad", needle = "sad"; Output 0. Input haystack = "leetcode", needle = "leeto"; Output -1

Constraints

1 ≤ haystack.length, needle.length ≤ 10⁴ haystack and needle consist of only lowercase English characters

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