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g0001_0100.s0028_implement_strstr.readme.md Maven / Gradle / Ivy

28\. Find the Index of the First Occurrence in a String

Medium

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`.

**Example 1:**

**Input:** haystack = "sadbutsad", needle = "sad"

**Output:** 0

**Explanation:** "sad" occurs at index 0 and 6. The first occurrence is at index 0, so we return 0.

**Example 2:**

**Input:** haystack = "leetcode", needle = "leeto"

**Output:** -1

**Explanation:** "leeto" did not occur in "leetcode", so we return -1.

**Constraints:**

*   1 <= haystack.length, needle.length <= 104
*   `haystack` and `needle` consist of only lowercase English characters.