Submission #549134

#	Time	Username	Problem	Language	Result	Execution time	Memory
549134		AJ00	Star triangles (IZhO11_triangle)	C++17	100 / 100	314 ms	15564 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long
int x[300000],y[300000];
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t=1,n; 
  //  cin >> t; 
    while (t--){
        cin >> n;
        map<int,int> cntx,cnty;
        for (int i = 0; i < n; i++){
            cin >> x[i] >> y[i];
            cntx[x[i]]++;
            cnty[y[i]]++;
        }
        int ans = 0;
        for (int i = 0; i < n; i++){
            ans += (int)(cntx[x[i]]-1)*(cnty[y[i]]-1);
        }
        cout << ans << "\n";
    }
    return 0;
}

• Subtask 1: 100 / 100