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Given an integer N, find its factorial.

**Example 1:**

**Input: **N = 5
**Output: **120
**Explanation **: 5! = 1*2*3*4*5 = 120

**Example 2:**

**Input: **N = 10
**Output: **3628800
**Explanation **:
10! = 1*2*3*4*5*6*7*8*9*10 = 3628800

**Your** **Task**:

You don't need to read input or print anything. Complete the function* factorial() *that takes integer N as input parameter and returns a list of integers denoting the digits that make up the factorial of N.

**Expected Time Complexity** : O(N^{2})

**Expected Auxilliary Space** : O(1)

**Constraints**:

1 ≤ N ≤ 1000

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Factorials of large numbers

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