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Fact Digit Sum
Easy Accuracy: 17.38% Submissions: 144 Points: 2

A(X) for positive integer X is the sum of factorials of its digits. For example, A(154) = 1! + 5! + 4!= 145.
Given a number N, find the minimum number X such that A(X) = N. 

 

Example 1:

Input: N = 40321
Output: 18
Explanation: A(18)=1!+ 8! =40321 
Note that A(80) = A(81) is also 
40321, But 18 is the smallest 
number.

 

Example 2:

Input: N = 5040
Output: 7
Explanation: A(7) = 7! = 5040.

 

Your Task:
You don't need to read or print anything. Your task is to complete the function FactDigit() which takes N as input parameter and returns a list of digits which represent the number X.

 

Expected Time Complexity: O(K) where K ≤ 106
Expected Space Complexity: O(K)

 

Constraints:
1 ≤ N ≤ 109

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