LeetCode 283

Move Zeros

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:

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

 public class Solution {
     public void moveZeroes(int[] nums) {
         int a = 0;
         int b = 0;
         for(int i = 0 ; i < nums.length ; i++){
             if( nums[i] == 0 ){
                 a++;
             }else{
                 nums[b] = nums[a];
                 a++;
                 b++;
             }
         }
         while(b < nums.length){
             nums[b]=0;
             b++;
         }
     }
 }