func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     long long n;     cin >> n;     long long a[n], b[n];     long long sum = 0, tum = 0, cnt = 0, aod = 0, aev = 0, bod = 0, bev = 0;     for (long long i = 0; i < n; i++) {       cin >> a[i] >> b[i];       if (a[i] % 2 == 0) aev++;       if (a[i] % 2 == 1) aod++;       if (b[i] % 2 == 0) bev++;       if (b[i] % 2 == 1) bod++;       sum += a[i];       tum += b[i];     }     if (sum % 2 == 0 and tum % 2 == 0) {       cout << 0;       return;     } else if (sum % 2 == 1 and tum % 2 == 1) {       for (long long i = 0; i < n; i++) {         if ((a[i] % 2 == 1 and b[i] % 2 == 0) or             (b[i] % 2 == 1 and a[i] % 2 == 0)) {           cout << 1;           return;         }       }       cout << -1;     } else       cout << -1;   }   int32_t main() {     ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);     solve();     return 0;   }   