UVA10228 A Star not a Tree?

Archie

出个好好的题卡什么输出格式

很简单的模拟退火

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<ctime>
using namespace std;
double delat=0.995;
struct po{
	double x;double y;
}p[10005];
double ansx,ansy,ans;
double sx,sy;
int t;
int n;
double cacultion(double x,double y){
	double ans=0;
	for(int i=1;i<=n;++i){
		double xx=p[i].x-x;
		double yy=p[i].y-y;
		ans+=sqrt(xx*xx+yy*yy);
	}
	return ans;
}
void sa(){
	double nx=ansx;
	double ny=ansy;
	double t=5000;
	while(t>1e-14){
		double nex=nx+((rand()<<1)-RAND_MAX)*t;
		double ney=ny+((rand()<<1)-RAND_MAX)*t;
		double nd=cacultion(nex,ney);
		double ex=nd-ans;
		if(ex<0){
			ansx=nex;
			ansy=ney;
			nx=nex;
			ny=ney;
			ans=nd; 
		} else{
			if(exp(-ex/t)*RAND_MAX>rand()){
				nx=nex;
				ny=ney;
			}
		}
		t*=delat;
	}
}
signed main(){
	srand(time(NULL));
	rand();
	scanf("%d",&t);
	while(t--){
		scanf("%d",&n);
		sx=0.0;
		sy=0.0;
		for(int i=1;i<=n;++i){
			cin>>p[i].x>>p[i].y;
			sx+=p[i].x;
			sy+=p[i].y;
		}
		ansx=(double)sx/n;
		ansy=(double)sy/n;
		ans=1e8;
		sa();
		sa();
		sa();
		sa();
		sa();
		sa();
		sa();
		sa();
		sa();
		sa();
		 if(t==0){
		 	cout<<round(ans)<<endl;
		 }else{
		 	cout<<round(ans)<<"\n\n"; 
		 }
	}
	return 0;
}