Submission #888128

#	Time	Username	Problem	Language	Result	Execution time	Memory
888128		tigran	Star triangles (IZhO11_triangle)	C++17	100 / 100	391 ms	13296 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    cin>>n;
    map <int, int> x, y;
    vector<pair<int, int>> queries;
    for(int i=0;i<n;i++){
        int X, Y;
        cin>>X>>Y;
        queries.push_back({X, Y});
        x[X]++;
        y[Y]++;
    }
    long long q=0;
    for(int i=0;i<n;i++){
        q+=(x[queries[i].first]-1)*(y[queries[i].second]-1);
    }
    cout<<q;
    return 0;
}

• Subtask 1: 100 / 100