Submission #1356675

#	Time	Username	Problem	Language	Result	Execution time	Memory
1356675		nathlol2	Star triangles (IZhO11_triangle)	C++20	100 / 100	63 ms	7824 KiB

triangle

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 3e5 + 5;
int n, ans, x[N], y[N];
unordered_map<int, int> xc, yc;

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n;
    for(int i = 1;i<=n;i++) cin >> x[i] >> y[i], xc[x[i]]++, yc[y[i]]++;
    for(int i = 1;i<=n;i++){
        ans += (xc[x[i]] - 1) * (yc[y[i]] - 1);
    }
    cout << ans;
}

• Subtask 1: 100 / 100