Leetcode [283] - Move Zeros (Java Solution)

Leetcode [283] - Move Zeros (Java Solution)
Category: Easy
What is used: Array

Question

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.

Example 1:

Input: [0,1,0,3,12]
Output: [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.

Solution

I am using Simple Array to solve this problem. There are various different methods to solve this problem but this is one the most straight forward and simple way.

I traverse through the array and keep count of non-zero numbers. While iterating through the array, set array[count++] = arr[i]. In the end, traverse again to set the remaining elements as zero.

class Solution {
    public void moveZeroes(int[] nums) {
        int count = 0;
        int n = nums.length;
        for (int i = 0; i < n; i++){
            if(nums[i] != 0){
                nums[count++] = nums[i];
            }
        }
        for (int j = count; j < n; j++){
            nums[j] = 0;
        }
    }
}

Time complexity:

The time complexity of this code is O(n)
The space complexity of this code is O(1)

Submission Details:

Runtime: 0 ms. Runtime beats 100.00 % of java submissions.
Memory Usage: 37.7 MB