This problem is so strange.
First is the word"?"should be"-1",otherwise you'll get WA.

Second,I have submitted 5 times the same programme(following),
but alternatively got "Crash(Access Violation)" and "Accepted".
Who knows why?



int factor[60];
int p=0;

int main()
{
    int i;
    long n;
    scanf("%ld",&n);
    if(n==0)printf("10");
    if(n==1)printf("1");
    if(n>=2)
    {
        while(1)
        {
            for(i=9;i>=2;i--)if(n%i==0)break;
            if(i>1)
            {
                n=n/i;
                p++;
                factor[p]=i;
                continue;
            }
            else break;
        }
        if(n>=10)printf("-1");
        else
        {
            for(i=p;i>=1;i--)
            {
                printf("%d",factor[i]);
            }
        }
    }
    return(0);
}

> This problem is so strange.
> First is the word"?"should be"-1",otherwise you'll get WA.
>
> Second,I have submitted 5 times the same programme(following),
> but alternatively got "Crash(Access Violation)" and "Accepted".
> Who knows why?
>
>
>
> int factor[60];
> int p=0;
>
> int main()
> {
>     int i;
>     long n;
>     scanf("%ld",&n);
>     if(n==0)printf("10");
>     if(n==1)printf("1");
>     if(n>=2)
>     {
>         while(1)
>         {
>             for(i=9;i>=2;i--)if(n%i==0)break;
>             if(i>1)
>             {
>                 n=n/i;
>                 p++;
>                 factor[p]=i;
>                 continue;
>             }
>             else break;
>         }
>         if(n>=10)printf("-1");
>         else
>         {
>             for(i=p;i>=1;i--)
>             {
>                 printf("%d",factor[i]);
>             }
>         }
>     }
>     return(0);
> }

My god ,I had got many WA ,because I'd printed ?. faint!