27. Remove Element@python

Given an array nums and a value val, remove all instances of that value in-place and return the new length.

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

The order of elements can be changed. It doesn't matter what you leave beyond the new length.

题目地址: Remove Element

难度: Easy

题意: 删除指定值,并将其他元素移动前面

思路:

遍历,双指针

代码:

class Solution(object):

    def removeElement(self, nums, val):

        """

        :type nums: List[int]

        :type val: int

        :rtype: int

        """

        n = len(nums)

        i, j = 0, n-1

        while i <= j:

            if nums[i] == val:

                nums[i], nums[j] = nums[j], nums[i]

                j -= 1

            else:

                i += 1

        return i

时间复杂度: O(n)

空间复杂度: O(1)

巴特西

27. Remove Element@python

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