Submission #880584

#	Time	Username	Problem	Language	Result	Execution time	Memory
880584		AlphaMale06	별들과 삼각형 (IZhO11_triangle)	C++14	100 / 100	245 ms	12304 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

map<int, int> xc;
map<int, int> yc;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    pair<int, int> a[n];
    for(int i=0; i< n; i++){
        cin >> a[i].first >> a[i].second;
        xc[a[i].first]++;
        yc[a[i].second]++;
    }
    ll ans=0;
    for(int i=0; i< n; i++){
        ans+=(xc[a[i].first]-1)*1ll*(yc[a[i].second]-1);
    }
    cout << ans << '\n';
}

• Subtask 1: 100 / 100