c++ UVA100

#include<iostream>
using namespace std;
int main()
{
unsigned long long i,j,length,tmp,max;
while(cin>>i>>j)
{
max=0;
cout<<i<<" "<<j<<" ";
if(i>j)                                               //很重要，我沒直接想到
{
unsigned long long change;
change=i;
i=j;
j=change;
}
for(unsigned long long k=i;k<=j;k++)
{
length=0;
tmp=k;
while(tmp!=1)
{
length++;
if(tmp%2==1)
tmp=3*tmp+1;
else
tmp=tmp/2;
}
if(tmp==1)
length++;
if(length>max)
max=length;
}
cout<<max<<endl;
}

return 0;
}