uva993 - Product of digits-水题 1A

uva993 - Product of digits-------------水题 1A

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <cmath>
#define N 105
using namespace std;
int n;
int a[10];
int main()
{
//    freopen("ex.in","r",stdin);
    int t;
    scanf("%d",&t);
    while(t--)
    {
        memset(a,0,sizeof(a));
        scanf("%d",&n);
        if(n<=9)
        {
            printf("%d\n",n);
            continue;
        }
        int i=9;
        while(i>=2)
        {
            if(n%i)
                i--;
            else
            {
                a[i]++;
                n/=i;
            }
        }
        if(n!=1)
        {
            printf("-1\n");
        }
        else
        {
            for(int i=2; i<=9; i++)
            {
                for(int j=0; j<a[i]; j++)
                    printf("%d",i);
            }
            printf("\n");
        }
    }
    return 0;
}