Sort an array of 0s 1s and 2s

Given an array which include 3 types of integer numbers (0,1,2). Our goal is to sort this array in ascending order. For example.

Example A
// Befor sort
arr[] = [0, 1, 0, 2, 2, 1, 2,0, 0, 2, 0, 1, 1, 0 ,2]

// After sort
arr[] = [0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2]

Example B
// Befor sort
arr[] = [1,2,0,0,1]
// After sort
arr[] = [0, 0, 1, 1, 2]

Solution by using counting

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