#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
cin.tie(0) -> ios_base::sync_with_stdio(0);
int n;
cin >> n;
vector<int> x(n), y(n);
map<int,int> px, py;
for(int i=0;i<n;i++)
{
cin >> x[i] >> y[i];
if(px.count(x[i]))
{
px[y[i]]++;
}
else
{
px[x[i]] = 1;
}
if(py.count(y[i]))
{
py[y[i]]++;
}
else
{
py[y[i]] = 1;
}
}
int ans = 0;
for(int i=0;i<n;i++)
{
int cx = 0, cy = 0;
if(px.count(x[i])) cx = px[x[i]];
if(py.count(y[i])) cy = py[y[i]];
ans += (cx - 1) * (cy - 1);
}
cout << ans << '\n';
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
0 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
312 KB |
Output is correct |
4 |
Incorrect |
1 ms |
204 KB |
Output isn't correct |
5 |
Halted |
0 ms |
0 KB |
- |