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public class Solution {
    public void sortColors(int[] nums) {
        int i = 0;
        int left = 0;
        int right = nums.length - 1;
        
        while (i <= right) {
            if (nums[i] == 0) {
                swap(nums, i++, left++);
            } else if (nums[i] == 2) {
                swap(nums, i, right--);
            } else {
                i++;
            }
        }
    }
    private void swap(int[] nums, int i, int j) {
        int tmp = nums[i];
        nums[i] = nums[j];
        nums[j] = tmp;
    }
}

   public void sortColors(int[] nums) {
        int start = 0;
        int end = nums.length - 1;
        int[] arr = new int[nums.length];
        for(int i = 0; i < nums.length; i++)
        {
            if(nums[i] == 0)
            {
                arr[start] = 0;
                start++;
            }
            else if(nums[i] == 2)
            {
                arr[end] = 2;
                end--;
            }
        }
        for(int i = start; i <= end; i++)
        {
            arr[i] = 1;
        }
        for(int i = 0; i < nums.length; i++)
        {
            nums[i] = arr[i];
        }
    }
}

public class Solution {
    public void sortColors(int[] nums) {
        
        int r = 0;
        int w = 0;
        int b = 0;
        for (int num : nums) {
            if (num == 0) {
                nums[b++] = 2;
                nums[w++] = 1;
                nums[r++] = 0;

            } else if (num == 1) {
                nums[b++] = 2;
                nums[w++] = 1;
            } else if (num == 2) {
                b++;
            }
        }
    }
}