#include<iostream>
#include<bits/stdc++.h>
#define MAXN 300010
using namespace std;
map<int,int> row,col;
pair<int,int> p[MAXN];
int main()
{
int n;
long long ans=0;
ios_base::sync_with_stdio(false);
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>p[i].first>>p[i].second;
row[p[i].second]++;
col[p[i].first]++;
}
for(int i=1;i<=n;i++)
{
long long l=row[p[i].first]-1;
long long r=row[p[i].second]-1;
l=l*r;
ans+=l;
}
cout<<ans<<"\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
5 |
Halted |
0 ms |
0 KB |
- |