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为何RE!!!!!!!!!!!!!#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
struct node{
int u,v,w,next;
}a[10001]={0};
int tot=0;
int last[101]={0};
void add(int x,int y,int z){
tot++;
a[tot].u=x;
a[tot].v=y;
a[tot].w=z;
a[tot].next=last[x];
last[x]=tot;
}
int fa[101]={0};
bool cmp(const node &a,const node &b){
return a.w<b.w;
}
int find(int x){
if(!fa[x]) return x;
else return fa[x]=find(fa[x]);
}
void unio(int x,int y){
fa[find(x)]=find(y);
}
int main(){
int q=0;
int res[1001]={0};
int x,y;
int m=0;
int n;
while(scanf("%d",&n)!=EOF){
int i,j,k;
memset(a,0,sizeof(a));
memset(fa,0,sizeof(fa));
tot=0;
memset(last,0,sizeof(last));
for(i=1;i<=n;i++)
for(j=1;j<=n;j++){
scanf("%d",&x);
if(x&&j<=i){
m++;
add(i,j,x);
}}
int ans=0;
sort(a+1,a+m+1,cmp);
k=0;
for(i=1;i<=m;i++){
if(k==n-1) break;
if(find(a[i].u)!=find(a[i].v)){
unio(a[i].u,a[i].v);
ans+=a[i].w;
}
}
res[q++]=ans;
}
for(int i=0;i<q;i++)
printf("%d\n",res[i]);
return 0;
}
/*4
0 4 9 21
4 0 8 17
9 8 0 16
21 17 16 0
4
0 4 9 21
4 0 8 17
9 8 0 16
21 17 16 0*/
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