Submission #888251

#	Time	Username	Problem	Language	Result	Execution time	Memory
888251		kokoue	Star triangles (IZhO11_triangle)	C++14	0 / 100	1 ms	2656 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
struct point
{
    int x,y;
};
point p[300000];
int x[100000],y[100000];
int n;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>p[i].x>>p[i].y;
        x[p[i].x]++;
        y[p[i].y]++;
    }
    int ans=0;
    for(int i=0;i<n;i++)
    {
        ans+=(x[p[i].x]-1)*(y[p[i].y]-1);
    }
    cout<<ans<<"\n";
}

• Subtask 1: 0 / 100