func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int sum = 0, sum1 = 0, c = 0;     int n, x, y, d;     cin >> n;     d = n;     while (n--) {       cin >> x;       sum = sum + x;       cin >> y;       sum1 = sum1 + y;       if (x % 2 == 0 && y % 2 == 1 || (y % 2 == 0 && x % 2 == 1)) c++;     }     cout << (sum % 2 == 0 && sum1 % 2 == 0                  ? 0                  : (sum % 2 == 1 && sum1 % 2 == 1 && c > 0 && d > 1 ? 1 : -1))          << endl;   }   