[OversouL]

Well, firstly, that code doesn't work right It's printing 10 5 1 for 20, when it should be printing 10 5 16 8 4 2 1. Once you fix that I'll show you a couple ways of shortening it

Oh, I divided the odd number by 3. XD

Code:

#include <iostream> int main(){int n;std::cin >> n;while(n > 1){n%2==0?n/=2:n=n*3+1;std::cout<<n<<" ";}return 0;}

I wonder why n*=3+1 doesn't work, like n=n*3+1 ??? Anyway, it's 114 bytes now.

Code:

#include <iostream> int main(){int n;std::cin>>n;while(n>1){n%2==0?n/=2:n=n*3+1;std::cout<<n<<" ";}return 0;}

110 bytes after removing some spaces. :3