最小生成树 - 题目

#21979. 最小生成树

统计

题目描述

给定结点数为 $n$，边数为 $m$ 的带权无向连通图 $G$，所有结点编号为 $1,2,\cdots,n$。

求 $G$ 的最小生成树的边权和。

输入格式

第一行两个正整数 $n,m$。

之后的 $m$ 行，每行三个正整数 $u_i,v_i,w_i$（$1\le u_i,v_i\le n$，$0\le w_i\le 10^9$），描述一条连接结点 $u_i$ 和 $v_i$，边权为 $w_i$ 的边。

输出格式

一个整数表示 $G$ 的最小生成树的边权和。

样例数据

样例输入

样例输出

子任务

$1\le n\le 2\times 10^5$，$0\le m\le 5\times 10^5$。

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