Submission #46822

#	Time	Username	Problem	Language	Result	Execution time	Memory
46822		Nnandi	Star triangles (IZhO11_triangle)	C++14	100 / 100	474 ms	40048 KiB

triangle

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

map<int,int> x;
map<int,int> y;
vector<pair<int,int> > pont;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    for(int i=0;i<n;i++) {
        int a, b;
        cin>>a>>b;
        x[a]++;
        y[b]++;
        pont.push_back(make_pair(a,b));
    }
    long long sol=0LL;
    for(auto ez:pont) {
        sol+=(x[ez.first]-1)*(y[ez.second]-1);
    }
    cout<<sol<<endl;
    return 0;
}

• Subtask 1: 100 / 100