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