Separate the Digits in an Array

This problem can be solved by using the list and map functions in Python.

The idea is to convert each integer into a string, then use the map function to convert each character of the string back into an integer. The list function is used to convert the map object into a list. Then, we flatten the list of lists into a single list using list comprehension.

Here is a Python code that implements this approach:

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class Solution:
    def separateDigits(self, nums: List[int]) -> List[int]:
        result = []
        for num in nums:
            num_str = str(num)
            for digit_str in num_str:
                digit = int(digit_str)
                result.append(digit)
        return result

In this code, we use list comprehension to iterate over each number in nums, convert the number into a string, and then iterate over each character in the string. We convert each character back into an integer and add it to the resulting list. The resulting list is a flat list that contains the digits of all numbers in the same order as they appear in nums.