#include <iostream> #include <vector> using namespace std; int main() { int m,n; while (cin>>m>>n) { int result=0,max,min; //①此处最为关键,因为题目中并未指明输入大的在前 if(m<=n) { min=m; max=n; } else { min=n; max=m; } for(int i=min;i<=max;i++) { int count=0; int temp=i; while(temp!=1) { count++; if(temp%2) temp=3*temp+1; else temp=temp/2; } //②最终的终止未计算在内,所以需要+1 count++; if (count>result) result=count; } cout<<m<<" "<<n<<" "<<result<<endl; } }