100 - The 3n + 1 problem.cpp

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,i,j;
    while(scanf("%d%d",&a,&b)==2 && a>0 && b>0)
    {
        int ans,sum=0;
        cout<<a<<" "<<b<<" ";
        if(a>b)
            swap(a,b);
        //cout<<a<<b<<endl;
        for(i=a; i<=b; i++)
        {
            ans=1;
            for(j=i; j!=1; j=j){
                if(j%2==0)
                    j/=2;
                else
                    j=3*j+1;
                ans+=1;
            }
            if(ans>=sum)
                sum=ans;
        }
        cout<<sum<<endl;
    }
    return 0;
}