func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = acos(-1.0);   const double EPS = 1e-10;   const int OO = 2147483647;   int dx[] = {1, -1, 0, 0};   int dy[] = {0, 0, -1, 1};   int main() {     ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);     int n;     cin >> n;     map<pair<long long, long long>, long long> st;     map<long long, long long> xs, ys;     long long ans = 0;     long long cnt = 0;     while (n--) {       int x, y;       cin >> x >> y;       ans += xs[x]++ + ys[y]++ - st[{x, y}]++;     }     cout << ans;     return 0;   }   