# **Leetcode筆記(Find the Index of the First Occurrence in a String)**

:::info
:information_source: 題目 : Find the Index of the First Occurrence in a String, 類型 : string , 等級 : easy
日期 : 2023/12/10，2024/04/02
:::

### 嘗試

class Solution(object):
    def strStr(self, haystack, needle):
        l = len(needle)
        for i in range(len(haystack)):
            if haystack[i : i + l] == needle:
                return i
        return -1

2024/04/02

class Solution:
    def strStr(self, haystack: str, needle: str) -> int:
        for i in range(len(haystack) - len(needle) + 1):
            if needle == haystack[i : i + len(needle)]:
                return i
        
        return -1

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### **優化**

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**思路**

**講解連結**

Provided by.