Submission #1219543

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219543		mariamp1	Star triangles (IZhO11_triangle)	C++20	100 / 100	170 ms	5468 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    vector<int> x(n), y(n);
    unordered_map<int, int> xcnt, ycnt;
    for (int i = 0; i < n; ++i) {
        cin >> x[i] >> y[i];
        xcnt[x[i]]++;
        ycnt[y[i]]++;
    }

    int result = 0;
    for (int i = 0; i < n; ++i) {
        result += (xcnt[x[i]] - 1) * (ycnt[y[i]] - 1);
    }
    cout << result << endl;

}

• Subtask 1: 100 / 100