3n+1.c

#include<stdio.h>

int cycle(int i){
	int length = 1;
	int n; 
	
    for(n = i ; n >= 1;){
		if(n == 1){ break; }

        if(n % 2 == 0){
            n = n / 2;
            length++;
        } else {
            n = 3*n + 1;
            length++;
        }
    }
    return length;
}

int main()
{
    int a, b, max, min, i, x, max_length = 0;

    while(scanf("%d %d",&a,&b) != EOF){
			
		if(a>b){ max=a; min=b; }
		else{ max=b; min=a;}

		max_length = -1;
		for(i = min; i <= max; i++){
		    x = cycle(i);
		    if(max_length < x)
		    max_length = x;
		}

		printf("%d %d %d\n", min, max, max_length);

    }
    return 0;
}