HDU 1032 The 3n + 1 problem

题解：简单模拟

#include <cstdio>  

#include <algorithm>

using namespace std;

int main(){  

    int n,m,num,cnt,max,i;  

    while(~scanf("%d %d",&m,&n)){  

        printf("%d %d ",m,n);

        if(m>n)swap(m,n);   

        for(max=0,i=m;i<=n;i++){  

            num=i; cnt=1;  

            while(num!=1){  

                if(num%2==0)num=num/2;  

                else num=3*num+1;cnt++; 

            }if(cnt>max)max=cnt;  

        }printf("%d\n",max);  

    }return 0;  

}