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++;
        }
    }
}