283. Move Zeroes

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.

Approach: Bring forward the non-zero values using a for loop and then fill the zeros at the end. 

class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int j = 0, n = nums.size();
        //move the non-zero elements to the front
        for(int i = 0; i < n; i++){
            if(nums[i] != 0){
                nums[j++] = nums[i];
            }
        }
        //fill the remaining right indices with zeros
        for(int i = j; i < n; i++){
            nums[i] = 0;
        }
    }
};

Here is the link to the ideone solution : http://ideone.com/O0MRQa