Sort Colors - Leetcode 75 Python

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Given an array with n objects colored red, white or blue, sort them in-place so that objects of the same color are adjacent, with the colors in the order red, white and blue.

Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.

Note: You are not supposed to use the library's sort function for this problem.

Example:

Input: [2,0,2,1,1,0]
Output: [0,0,1,1,2,2]

[DayoAjayi]

Thank you for such a clear explanation!

[RobertLugg]

Why not just count up the numbers and fill the array?