# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
333633 | apostoldaniel854 | Star triangles (IZhO11_triangle) | C++14 | 422 ms | 13404 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;
using ll = long long;
#define pb push_back
#define dbg(x) cerr << #x << " " << x << "\n"
int main () {
ios::sync_with_stdio (false);
cin.tie (0); cout.tie (0);
int n;
cin >> n;
vector <pair <int, int>> points;
map <int, int> onX, onY;
for (int i = 1; i <= n; i++) {
int x, y;
cin >> x >> y;
points.pb ({x, y});
onX[x]++;
onY[y]++;
}
ll ans = 0;
for (pair <int, int> p : points)
ans += 1ll * (onX[p.first] - 1) * (onY[p.second] - 1);
cout << ans << "\n";
return 0;
}
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