60分wa求救
#include<bits/stdc++.h>
using namespace std;
int n;
int abs(int a){return a<0?-a:a;}
struct str{
int x,y,sum;
}f[200039];
int _x,_y;
int main(){
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d%d",&f[i].x,&f[i].y);
}
double k=100000;
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
_x=abs(f[j].x-f[i].x);
_y=abs(f[j].y-f[i].y);
if(k>((double)_x*_x+_y*_y))
k=((double)_x*_x+_y*_y);
}
}
printf("%.4lf\n",sqrt(k));
}