Given a list containing only integers 0, 1, and 2 (representing the colors red, white, and blue), sort the list so that all 0s come first, followed by all 1s, and then all 2s. Return the sorted list. Return null if the input is null.
Example 1:
Input: nums = [2, 0, 2, 1, 1, 0]
Output: [0, 0, 1, 1, 2, 2]
Explanation: Sorted with all 0s first, then 1s, then 2s
Example 2:
Input: nums = [0, 1, 2]
Output: [0, 1, 2]
Explanation: Already sorted, no changes needed
Example 3:
Input: nums = [1, 1, 1]
Output: [1, 1, 1]
Explanation: All same color, order is unchanged
Example 4:
Input: nums = null
Output: null
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