Find the Index of the First Occurrence in a String

08 Aug 2025 in Dev / Codingtest on CodingTest

• LeetCode Find the Index of the First Occurrence in a String
  • 문제
  • 예시
• 풀이

LeetCode Find the Index of the First Occurrence in a String

문제

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.

예시

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.

풀이

class Solution:
    def strStr(self, haystack: str, needle: str) -> int:
        return haystack.find(needle)