func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, c = 0, i, aa = 0, bb = 0;     cin >> n;     int a[n], b[n];     for (i = 0; i < n; i++) {       cin >> a[i] >> b[i];       aa = aa + a[i];       bb = bb + b[i];     }     if (aa % 2 == 1 && bb % 2 == 1) {       for (i = 0; i < n; i++) {         if ((a[i] + b[i]) % 2 == 1) {           c++;           break;         }       }     }     if (aa % 2 == 0 && bb % 2 == 0)       cout <<  0 ;     else if (c == 1)       cout <<  1 ;     else       cout <<  -1 ;   }   