func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int x, y;     cin >> x >> y;     if (y == 0) {       cout <<  No  << endl;       return 0;     }     y = y - 1;     if (y >= 1) {       x = x - y;       if (x >= 0 && x % 2 == 0) {         cout <<  Yes  << endl;       } else {         cout <<  No  << endl;       }     } else {       if (x == 0) {         cout <<  Yes  << endl;       } else         cout <<  No  << endl;     }     return 0;   }   