Move Zeroes

Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Note that you must do this in-place without making a copy of the array.

 

Example 1:

Input: nums = [0,1,0,3,12]
Output: [1,3,12,0,0]

Example 2:

Input: nums = [0]
Output: [0]

Solution

class Solution {

public void moveZeroes(int[] nums) {

int nonZeroIndex = 0;

// move non zero numbers

for(int i=0; i<nums.length; i++) {

if(nums[i] != 0) {

nums[nonZeroIndex++] = nums[i];

}

}

// append 0s

for(int j=nonZeroIndex; j < nums.length; j++) {

nums[j] = 0;

}

}

}