题解 | #xxx定律#

#include <iostream>
using namespace std;
int main()
{
    int a;
    while (cin >> a)
    { // 注意 while 处理多个 case
        int sum = 0;
        while (a != 1)
        {
            if (a % 2 == 0)
                a = a / 2;

            else
                a = (3 * a + 1) / 2;
//sum+=sum;  你可真聪明
            sum  = sum +1;
        }
        cout << sum << endl;
    }
    return 0;
}
// 64 位输出请用 printf("%lld")