不会的看我！！！

#include <bits/stdc++.h>
using namespace std;
const int N = 100001;
typedef double dd;
int n;
dd x[N],y[N];
dd calc_dis(dd x1,dd y1,dd x2,dd y2){
	return sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2));
}
int main(){
	cin>>n;
	for(int i=1;i<=n;i++) cin>>x[i]>>y[i];
	//枚举 
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;++j){
			cout<<fixed<<setprecision(2)<<calc_dis(x[i],y[i],x[j],y[j])<<" "; 
		}
		cout<<"\n";
	} 
    return 0;
}