摘要：
You are given two strings of the same length `s` and `t`. In one step you can choose **any character** of `t` and replace it with **another character* 阅读全文
摘要：
Given an array `arr` of integers, check if there exist two indices `i` and `j` such that : - `i != j` - `0 这道题给了一个整型数组，让检测是否有一个数字和其倍数同时存在的情况。一看到这道题博主就 阅读全文
