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  1. class ReverseFactorial {
  2. 	    public static void main(String[] args) {
  3. 		    int[] input = {
  4. 			    3628800,
  5. 			    479001600,
  6. 			    6,
  7. 			    18
  8. 		    };
  9.  
  10. 		    for(int cur: input)
  11. 			    System.out.printf("%d: %s\n", cur, reverseFactorial(cur));
  12. 	    }
  13.  
  14. 	    public static String reverseFactorial(int x) {
  15. 		    for(int i = 0; factorial(i) <= x; i++)
  16. 			    if(factorial(i) == x)
  17. 				    return Integer.toString(i) + "!";
  18. 		    return "NONE";
  19. 	    }
  20.  
  21. 	    public static int factorial(int x) {
  22. 		    return x > 0 ? x * factorial(x - 1) : 1;
  23. 	    }
  24. }
Success #stdin #stdout 0.11s 320576KB
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Standard input is empty
stdout
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3628800: 10!
479001600: 12!
6: 3!
18: NONE
https://ideone.com/87ubcy
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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