#include<bits/stdc++.h>
#define maxn 300000
using namespace std;
pair<int,int> a[maxn+5];
int u[maxn+5];
int o[maxn+5];
int main() {
int n;
cin >>n;
for(int i = 1; i <= n; i++) {
cin >>a[i].first >>a[i].second;
u[a[i].first]++;
o[a[i].second]++;
}
int s = 0;
for(int i = 1; i <= n; i++) {
s += (u[a[i].first]-1) * (o[a[i].second]-1);
}
cout<<s;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
368 KB |
Output is correct |
2 |
Correct |
2 ms |
504 KB |
Output is correct |
3 |
Correct |
2 ms |
552 KB |
Output is correct |
4 |
Correct |
2 ms |
552 KB |
Output is correct |
5 |
Incorrect |
2 ms |
608 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |