func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     int n;     cin >> n;     map<int, int> mx, my;     map<pair<int, int>, int> mp;     for (int i = 0; i < n; i++) {       int first, second;       cin >> first >> second;       mx[first]++;       my[second]++;       mp[{first, second}]++;     };     long long ans = 0;     for (auto it : mx) {       ans += (long long)it.second * (it.second - 1) / 2;     }     for (auto it : my) {       ans += (long long)it.second * (it.second - 1) / 2;     }     for (auto it : mp) {       ans -= (long long)it.second * (it.second - 1) / 2;     }     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     solve();     return 0;   }   