http://poj.org/problem?id=1207
注意输入两个数的大小,水。。。
#include <stdio.h> int main(void) {int a,b,m,count,i,max;while(scanf("%d%d",&a,&b)!=EOF){printf("%d %d ",a,b);if(a>b){m=a;a=b;b=m;}max=0;for(i=a;i<=b;i++){m=i;count=1;while(m!=1){if(m%2)m=3*m+1;elsem/=2;count++;}if(count>max)max=count;}printf("%d\n",max);}return 0; }