Submission #1308542

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308542		buinamkhanh	별들과 삼각형 (IZhO11_triangle)	C++20	100 / 100	394 ms	9236 KiB

triangle

#include <iostream>
#include <map>
#define int long long
using namespace std;
int n,x[300005],y[300005],ans=0;
map<int,int> cx,cy;
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    cin>>n;
    for (int i=0; i<n; i++) {
        cin>>x[i]>>y[i];
        cx[x[i]]++;cy[y[i]]++;
    }
    for (int i=0; i<n; i++)
        ans+=(cx[x[i]]-1)*(cy[y[i]]-1);
    cout<<ans;
}

• Subtask 1: 100 / 100