Find the Index of the First Occurrence
Easy
String
String Matching
Two Pointers
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:
["sadbutsad","sad"]Output:
0Explanation: "sad" occurs at index 0 and 6. The first occurrence is at index 0.
Input:
["leetcode","leeto"]Output:
-1Explanation: "leeto" did not occur in "leetcode".
Constraints:
- 1 ≤ haystack.length, needle.length ≤ 10⁴
- haystack and needle consist of only lowercase English characters.
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