Submission #702108

#	Time	Username	Problem	Language	Result	Execution time	Memory
702108		Darren0724	Star triangles (IZhO11_triangle)	C++17	100 / 100	300 ms	15572 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n;cin>>n;
    map<int,int> x,y;
    vector<int> a(n),b(n);
    for(int i=0;i<n;i++){
        cin>>a[i]>>b[i];
        x[a[i]]++;
        y[b[i]]++;
    }
    int ans=0;
    for(int i=0;i<n;i++){
        ans+=(x[a[i]]-1)*(y[b[i]]-1);
    }
    cout<<ans<<endl;


	return 0;
}

• Subtask 1: 100 / 100