🐍 Day 9: Loops (for / while) In Python, loops let you run a block of code multiple times, automatically, without writing it again and again. They’re essential for repetition, automation, and working ...

在 haystack 字符串中找出 needle 字符串出现的第一个位置 (从0开始)。如果不存在，则返回 -1。

Day 11/100 – Implement strStr() (LeetCode #28) Today I solved a classic substring search problem. The task is to find the index of the first occurrence of one string inside another. 👉 If needle is ...