FactorialSystem (code jam china round2 300分真题) (第二轮淘汰赛)

Problem Statement
	In the factorial number system the value of the first digit (from the right) is 1!, the value of the second digit is 2!, ..., and the value of the n-th digit is n!. This means that any decimal number d can be written in this system as: anan-1...a2a1, where d = an * n! + an-1 * (n-1)! + ... + a2 * 2! + a1 * 1! and 0 <= ai <= i for all i. Given an int num in decimal, return its representation in the factorial number system.
Definition
	Class: FactorialSystem Method: convert Parameters: int Returns: int Method signature: int convert(int num) (be sure your method is public)
Notes
-	n! = 1 * 2 * ... * n
Constraints
-	num will be between 1 and 3628799 (10!-1), inclusive.
Examples
0)
	1 Returns: 1
1)
	24 Returns: 1000 24 = 4!
2)
	153 Returns: 11111 153 = 1! + 2! + 3! + 4! + 5!.
3)
	133 Returns: 10201
4)
	3628799 Returns: 987654321 Largest possible input.

 

 

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