c语言全部超时，是不是死循环啊，求大佬解答5555

#include<stdio.h>
int main()
{
    int a,i;
    int b[i];
    scanf("%d",&a);
    do{i=0;
        i++;}
    while(b[i]!=1);{
        if(a%2==0){
            b[i]=a/2;
            a=a/2;}
        else
            {b[i]=a*3+1;
            a=a*3+1;}}
    printf("%d",b[i]);
    int count=i;
    for(i=count;i>=0;i--){
        printf("%d",b[i]);}
return 0;}