这道题用传统快排(如下所示)的结果就是最后三个点TLE: void swap(int &a, int &b) { int tmp = a; a = b; b = tmp; } void quickSort(int a[], int left, int right) { if (left >= right) return; int i = left, j = right; while (i < j) { while (j > i && a[j] >=…
题目: 给定一个整数数组和一个整数 k,判断数组中是否存在两个不同的索引 i 和 j,使得 nums [i] = nums [j],并且 i 和 j 的差的绝对值最大为 k. Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolute…
Explain 语法 # 语法 explain + DQL语句 mysql> explain select * from city where countrycode ='CHN' or countrycode ='USA'; # 查询中国和美国的数据 mysql> select * from city where countrycode ='CHN' or countrycode ='USA'; mysql> select * from city where countrycode i…
