Submission #1247056

#	Time	Username	Problem	Language	Result	Execution time	Memory
1247056		amaw	Star triangles (IZhO11_triangle)	C++20	100 / 100	1174 ms	30936 KiB

triangle

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

int main() {
    int n;
    cin >> n;
    
    int x[n]; int y[n];
    multiset<int> X; multiset<int> Y;
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
        X.insert(x[i]); Y.insert(y[i]);
    }
    
    int res = 0;
    
    for (int i = 0; i < n; i++) {
        int cntX = X.count(x[i]) - 1;
        int cntY = Y.count(y[i]) - 1;
        res += cntX * cntY;
    }
    
    cout << res;
    
    
}

• Subtask 1: 100 / 100