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老是wa 找不到错误,望高人指点

Posted by 200930690129 at 2011-04-14 09:16:04 on Problem 2421
#include"stdio.h"
#include<algorithm>

#define maxver 100
#define maxedge 4950
using namespace std;

typedef struct{
	int u;
	int v;
	int w;
}Edge;

bool cmp(Edge e1,Edge e2){
	return e1.w<e2.w;
}

Edge ed[maxedge];
int p[maxver],r[maxver];

void make_set(int x){
		p[x]=x;
		r[x]=1;
}

int find_set(int x){
	if(x!=p[x])
		p[x]=find_set(p[x]);
	return p[x];
}

void union_set(int x,int y){
	int i=find_set(x);
	int j=find_set(y);
	if(r[i]>r[j])
		p[j]=i;
	else
		if(r[i]<r[j])
			p[i]=j;
		else{
			r[j]++;
			p[i]=j;
		}

}


int kruskal(int n){
	int i,sum=0;
	for(i=1;i<=n;i++)
		make_set(i);
	sort(ed+1,ed+n*(n-1)/2+1,cmp);
	for(i=1;i<n;i++){
		if(find_set(ed[i].u)!= find_set(ed[i].v)){
				union_set(ed[i].u,ed[i].v);
				sum+=ed[i].w;
		}
				
	}
	return sum;
}


int main(){
	int n,q;
	int i,j,k=1,v1,v2;
	int w;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++){
			scanf("%d",&w);
			if(j>i){
				ed[k].u=i;
				ed[k].v=j;
				ed[k].w=w;
				k++;
			}
		}
	scanf("%d",&q);
	for(i=1;i<=q;i++){
		scanf("%d%d",&v1,&v2);
		k=(v1-1)*n+v2-(v1+1)*v1/2;
		ed[k].w=0;
	}
	printf("%d\n",kruskal(n));
	return 1;
}

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