xxx定律：
#include<iostream>
using namespace std;
int main(){
int n;
while(cin>>n&&n){
int count=0;
while(n!=1){
if(n%2==0)
n/=2;
else
n=(3*n+1)/2;
++count;
}
cout<<count<<endl;
}
return 0;
}本文出自 “菜鳥的進階之路” 博客，請務必保留此出處http://beyond316.blog.51cto.com/7367775/1273029
