1、题目:
2、代码:
#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
struct edge
{
int u;
int v;
int w;
} e[500005];
int father[10005];
bool cmp1(edge e1,edge e2)
{
return e1.w<e2.w;
}
int UFfind(int x)
{
if(x!=father[x])
{
father[x]=UFfind(father[x]);
}
return father[x];
}
int main()
{
int n,m;
int ans=0,count=0;
scanf("%d%d",&n,&m);
int i;
for(i=0; i<n; i++)
{
father[i]=i;
}
for(i=0; i<m; i++)
{
scanf("%d%d%d",&e[i].u,&e[i].v,&e[i].w);
}
sort(e,e+m,cmp1);
for(i=0; i<m; i++)
{
int fa=UFfind(e[i].u);
int fb=UFfind(e[i].v);
if(fa!=fb)
{
father[fa]=fb;
ans+=e[i].w;
count++;
}
if(count==n-1)
{
break;
}
}
printf("%d\n",ans);
return 0;
}