Submission #1109762

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109762		Kirill22	Star triangles (IZhO11_triangle)	C++17	100 / 100	304 ms	12332 KiB

triangle

#include "bits/stdc++.h"

using namespace std;

void solve() {
    int n;
    cin >> n;
    vector<pair<int, int>> a(n);
    map<int, int> dx, dy;
    for (auto& [x, y] : a) {
        cin >> x >> y;
        dx[x]++;
        dy[y]++;
    }
    long long ans = 0;
    for (auto& [x, y] : a) {
        ans += (dx[x] - 1) * 1ll * (dy[y] - 1);
    }
    cout << ans << '\n';
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
//    cin >> t;
    while (t--) {
        solve();
    }
}

• Subtask 1: 100 / 100