Submission #344249

#	Time	Username	Problem	Language	Result	Execution time	Memory
344249		katearima	Star triangles (IZhO11_triangle)	C++14	100 / 100	671 ms	12396 KiB

triangle

#include <bits/stdc++.h>
#define ss second
#define ff first
using namespace std;
const int N=3e5+10;
int n, x[N], y[N], ans;
map<int, int> fx, fy;
main(){
    cin>>n;
    for(int i=0; i<n; i++){
        cin>>x[i]>>y[i];
        fx[x[i]]++;
        fy[y[i]]++;
    }
    for(int i=0; i<n; i++){
        ans+=(fx[x[i]]-1)*(fy[y[i]]-1);
    }
    cout<<ans<<endl;



}

Compilation message (stderr)

triangle.cpp:8:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main(){
      |      ^

• Subtask 1: 100 / 100