Submission #974705

#	Time	Username	Problem	Language	Result	Execution time	Memory
974705		vjudge1	Star triangles (IZhO11_triangle)	C++14	100 / 100	238 ms	12144 KiB

triangle

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n; 
    ll ans = 0;
    cin >> n;
    vector<int> x(n), y(n);
    map<int, int> mpX, mpY;


    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
        mpX[x[i]]++;
        mpY[y[i]]++;
    }

    for (int i = 0; i < n; i++) {
        ans += (ll)(mpX[x[i]] - 1) * (mpY[y[i]] - 1);
    }

    cout << ans << "\n";
}

• Subtask 1: 100 / 100