Leetcode: Move Zeroes

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.

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.


## Blog link: https://code.dennyzhang.com/move-zeroes
class Solution(object):
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        ## Idea: 2 pointers
        ## Complexity: Time O(n), Space O(1)
        ## 1, 2, 0, 3, 12
        ## i points to place whose value is 0
        ## j starts from i+1, point to the place of first non-Zero value
        length = len(nums)
        j = 0
        for i in range(0, length-1):
            if nums[i] == 0:
                for j in range(i+1, length):
                    if nums[j] != 0:
                        nums[i] = nums[j]
                        nums[j] = 0
                        i = j
                        break
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