Sort Colors

Challenge Points: 20

Level: Medium

You are given an array nums containing 0s, 1s, and 2s, representing three colors.
Sort the array in-place so that all 0s come first, then 1s, and then 2s.
Do not use any built-in sort function.

Example 1:

Input: nums = [1,2,0,2,1,0,1]

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

Explanation:

All the 0s are first, followed by 1s, then 2s.

Example 2:

Input: nums = [2,1,0,1]

Output: [0,1,1,2]

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