Move Zeros

Move Zeros two pointers

Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note: You must do this in-place without making a copy of the array. Minimize the total number of operations.

Move Zeros Solution

public class MoveZeros {
    public void moveZeroes(int[] nums) {
        if(nums == null || nums.length == 0) {
            return;
        }

        int index = 0;
        for(int num : nums) {
            if(num != 0) {
                nums[index] = num;
                index++;
            }
        }

        while(index < nums.length) {
            nums[index] = 0;
            index++;
        }
    }
}

Last modified October 4, 2020