HDU 1173 采矿

设答案为x，y

则距离的运算公式为|x-x1|+|x-x2|+...+|x-xn|+|y-y1|+|y-y2|+...+|y-yn|

因此当x，y均为中位数时上式最小

用cin耗时2687ms

用scanf耗时453ms

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
#include<vector>
#include<queue>

using namespace std;

const int maxN=1000010;

struct Point{
double x,y;
}p[maxN];

bool cmpx(Point a,Point b){
return a.x<b.x;
}

bool cmpy(Point a,Point b){
return a.y<b.y;
}

int main(){
#ifndef ONLINE_JUDGE
freopen("a.in","r",stdin);
//freopen("a.out","w",stdout);
#endif
int n;
while(cin>>n,n){
for(int i=0;i<n;++i)
scanf("%lf%lf",&p[i].x,&p[i].y);
sort(p,p+n,cmpx);
printf("%.2f\n",p[n/2].x);
sort(p,p+n,cmpy);
printf("%.2f\n",p[n/2].y);
}
return 0;
}