http://acm.pku.edu.cn/JudgeOnline/problem?id=1207
Код:
#include <stdio.h>
int foo(int n)
{
int c;
for(c=1;n!=1;c++) {
if(n&1) n=3*n+1;
else n>>=1;
}
return c;
}
int main()
{
int a,b,t,i,max,at,bt;
while(scanf("%d %d", &a, &b)==2) {
at=a;bt=b;
if(a>b) {int tmp=a;a=b;b=tmp;}
max=0;
for(i=a;i<=b;i++) {
t = foo(i);
if(max<t) max=t;
}
printf("%d %d %d\n", at,bt,max);
}
return 0;
}