oj.uz

Submission #839213

# Submission time Handle Problem Language Result Execution time Memory
839213 2023-08-29T06:00:55 Z Alfraganus Star triangles (IZhO11_triangle) C++17
0 / 100
 1 ms 212 KB 
#include <bits/stdc++.h>
using namespace std;

#define fs first
#define ss second
#define ll long long

int main(){
    int n;
    cin >> n;
    map<int, int> X, Y;
    vector<pair<int, int>> a(n);
    for(int i = 0; i < n; i ++){
        cin >> a[i].fs >> a[i].ss;
        X[a[i].fs] ++;
        Y[a[i].ss] ++;
    }
    ll ans = 0;
    for(int i = 0; i < n; i ++)
        ans += 1ll * X[a[i].fs] * Y[a[i].ss];
    cout << ans;
}

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -