OJ-Problems-Source/HDOJ/2988_autoAC.cpp

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#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define maxn 200010
struct node{
int u,v,w;
}edge[maxn];
int parent[maxn];
int n,m,ans,sum;
int cmp(const node &p,const node &q){
return p.w<q.w;
}
int Find(int x){
int i;
for(i=x;parent[i]>=0;i=parent[i])
;
while(i!=x){
int tmp=parent[x];
parent[x]=i;
x=tmp;
}
return i;
}
void Union(int x,int y){
int r1=Find(x),r2=Find(y);
if(r1==r2) return;
if(parent[r1]<parent[r2]){
parent[r1]+=parent[r2];
parent[r2]=r1;
}else {
parent[r2]+=parent[r1];
parent[r1]=r2;
}
}
int Kruskal(){
int s=0;
for(int i=0;i<m;i++){
int u=edge[i].u,v=edge[i].v,w=edge[i].w;
if(Find(u)!=Find(v)){
s+=w;
Union(u,v);
}
}
return s;
}
int main(){
while(~scanf("%d %d",&n,&m)&&m+n){
memset(parent,-1,sizeof(parent));
ans=0;
for(int i=0;i<m;i++){
scanf("%d %d %d",&edge[i].u,&edge[i].v,&edge[i].w);
ans+=edge[i].w;
}
sort(edge,edge+m,cmp);
sum=Kruskal();
printf("%d\n",ans-sum);
}
return 0;
}