Submission #1086297

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086297		toast12	Star triangles (IZhO11_triangle)	C++14	100 / 100	384 ms	12268 KiB

triangle

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

using ll = long long;

int main() {
    int n;
    cin >> n;
    map<int, int> x, y;
    vector<pair<int, int>> points(n);
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        x[a]++, y[b]++;
        points[i].first = a, points[i].second = b;
    }
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        ans += 1ll*(x[points[i].first]-1)*(y[points[i].second]-1);
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 100 / 100