Submission #1346649

#	Time	Username	Problem	Language	Result	Execution time	Memory
1346649		killerzaluu	Star triangles (IZhO11_triangle)	C++20	100 / 100	248 ms	9224 KiB

triangle

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<pair<long long,long long>> a(n);
    map<long long,long long> cntx, cnty;

    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
        cntx[a[i].first]++;
        cnty[a[i].second]++;
    }

    long long ans = 0;
    for (int i = 0; i < n; i++) {
        long long x = a[i].first;
        long long y = a[i].second;
        ans += (cntx[x] - 1) * (cnty[y] - 1);
    }

    cout << ans << '\n';
    return 0;
}

• Subtask 1: 100 / 100