283. Move Zeroes (1)

Link

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:

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

Two pointer 紀錄要換的位置, 然後把最後一個位置以後地都設0

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