Submission #1254324

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254324		warrenn	Star triangles (IZhO11_triangle)	C++20	100 / 100	253 ms	12724 KiB

triangle

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

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    map<int,int>x,y;
    vector<pair<int,int> >tmp;

    for(int q=1;q<=n;q++){
        int a,b;
        cin>>a>>b;
        x[a]++; y[b]++;
        tmp.push_back({a,b});
    }
    int ans=0;
    for(auto r : tmp){
        ans+=(x[r.first]-1)*(y[r.second]-1);
    }
    cout<<ans<<endl;
}

• Subtask 1: 100 / 100