UVa100 The 3n + 1 problem

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=36

注意 i j的大小不定，得调整。国外的都这么坑吗。

#include<iostream>
#define ll long long
using namespace std;
int s(ll n)
{
    int c;
    for(c=1;n!=1;c++)
    {
      if(n&1)n=n*3+1;
      else n/=2;
    }
    return c;
}

int main()
{
    int a,b,t;
    while(cin>>a>>b)
    {
      cout<<a<<" "<<b<<" ";
      if(a>b){t=a;a=b;b=t;}
      int Max=-1;
      for(int i=a;i<=b;i++)
      {
          int k=s(i);
          if(k>Max) Max=k;
      }
      cout<<Max<<endl;
    }
}