Submission #336085

#	Time	Username	Problem	Language	Result	Execution time	Memory
336085		nikatamliani	Star triangles (IZhO11_triangle)	C++14	100 / 100	700 ms	12172 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
const int N = 3e5+10;
int x[N], y[N];
map<int,int> X, Y;
int main() {
    int n;
    cin >> n;
    for(int i = 1; i <= n; ++i) {
        cin >> x[i] >> y[i];
        ++X[x[i]];
        ++Y[y[i]];
    }
    long long ans = 0;
    for(int i = 1; i <= n; ++i) {
        ans += (long long)(X[x[i]] - 1) * (Y[y[i]] - 1); 
    }
    cout << ans << '\n';
}

• Subtask 1: 100 / 100