# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1112593 | Chinguun | Star triangles (IZhO11_triangle) | C++14 | 290 ms | 9244 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N = 3e5 + 7;
int n, a[N], b[N], ans;
map <int, int> x, y;
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i] >> b[i];
x[a[i]]++; y[b[i]]++;
}
for (int i = 1; i <= n; i++) {
ans += (x[a[i]] - 1) * (y[b[i]] - 1);
}
cout << ans;
return 0;
}
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