UVa/993 - Product of digits/993.cpp

   1 /*
   2   Problem: 993 - Product of digits
   3   Author: Andrés Mejía-Posada
   4   (http://blogaritmo.factorcomun.org)
   5
   6  */
   7
   8 using namespace std;
   9 #include <algorithm>
  10 #include <iostream>
  11 #include <iterator>
  12 #include <sstream>
  13 #include <fstream>
  14 #include <cassert>
  15 #include <climits>
  16 #include <cstdlib>
  17 #include <cstring>
  18 #include <string>
  19 #include <cstdio>
  20 #include <vector>
  21 #include <cmath>
  22 #include <queue>
  23 #include <deque>
  24 #include <stack>
  25 #include <map>
  26 #include <set>
  27
  28 #define D(x) cout << #x " is " << x << endl
  29
  30 int main(){
  31   int c;
  32   for (cin >> c; c--; ){
  33     int n;
  34     cin >> n;
  35
  36     if (n == 1){
  37       cout << 1 << endl;
  38       continue;
  39     }
  40
  41     string ans = "";
  42     for (int i=9; i>=2; --i){
  43       while (n % i == 0){
  44         n /= i;
  45         ans = char(i+'0') + ans;
  46       }
  47     }
  48
  49     if (n > 1){
  50       ans = "-1";
  51     }
  52
  53     cout << ans << endl;
  54   }
  55   return 0;
  56 }