Kruskal算法的高效实现需要一种称作并查集的结构。我们在这里不介绍并查集，只介绍Kruskal算法的基本思想和证明，实现留在以后讨论。 Kruskal算法的过程： （1） 将 ...

题目链接： https://codeforces.com/problemset/problem/1622/C 题目大意： 给定一个序列 \(a_1\)，\(a_2\)，\(a_3\) ... \ ...

There are n buildings in a line. You are given an integer array heights of size n that represents th ...

Given an array nums, you are allowed to choose one element of nums and change it by any value in one ...