摘要：A social media company is trying to monitor activity on their site by analyzing the number of tweets that occur in select periods of time. These perio 阅读全文

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

摘要：Given an array of integers `arr`, you are initially positioned at the first index of the array. In one step you can jump from index `i` to index: - `i 阅读全文