H - Highways

H - Highways

G++提交 C++ TLE

#include<cmath>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define MAXN 1010
using namespace std;
int fa[MAXN];
int n,m,tot,sum;
double x[MAXN],y[MAXN];
struct nond{
    int x,y;double z;
}v[MAXN*MAXN];
int cmp(nond a,nond b){
    return a.z<b.z;
}
int find(int x){
    if(fa[x]==x)    return x;
    else return fa[x]=find(fa[x]);
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        scanf("%lf%lf",&x[i],&y[i]);
    for(int i=1;i<=n;i++)
        for(int j=i+1;j<=n;j++){
            double tmp=(x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j]);
            v[++tot].x=i;v[tot].y=j;v[tot].z=tmp;
        }
    scanf("%d",&m);
    for(int i=1;i<=m;i++){
        int x,y;scanf("%d%d",&x,&y);
        v[++tot].x=x;v[tot].y=y;v[tot].z=0;
    }
    for(int i=1;i<=n;i++)    fa[i]=i;
    sort(v+1,v+1+tot,cmp);
    for(int i=1;i<=tot;i++){
        int dx=find(v[i].x);
        int dy=find(v[i].y);
        if(dx==dy)    continue;
        fa[dy]=dx;sum++;
        if(v[i].z!=0)    cout<<v[i].x<<" "<<v[i].y<<endl;
        if(sum==n-1)    break;
    }
}