283. Move Zeroes(C++/Java)

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

C++:

class Solution {
public:
    void moveZeroes(vector& nums) {
        if (nums.empty() || nums.size() == 0) return;
        
        int insertPos = 0;
        for (auto num : nums) {
            if (num != 0) nums[insertPos++] = num;
        }
        
        while (insertPos < nums.size()) {
            nums[insertPos++] = 0;
        }
    }
};

Java:

class Solution {
    public void moveZeroes(int[] nums) {
        if (nums == null || nums.length == 0) return;
        int i = 0;
        for (int num : nums) 
            if (num != 0) nums[i ++] = num; 
        while (i < nums.length)
            nums[i ++] = 0;
    }
}