two pointers

283. Move Zeroes

tip

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]

class Solution {
    public void moveZeroes(int[] nums) {
        int slow = 0;
        int fast = 0;
        while(fast < nums.length) {
            if(nums[fast] != 0) {
                nums[slow] = nums[fast];
                slow ++;
            }
            fast ++;
        }
        while(slow < nums.length) {
            nums[slow ++] = 0;
        }
    }
}