Remove Element

Problem

Given an array and a value, 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.

Example:

Given nums = [3,2,2,3], val = 3,

Your function should return length = 2, with the first two elements of nums being 2.

Related Topics:

Array Two Pointers

Analysis

顺序不变:设置两个标记点,一个用来遍历数组,过滤掉指定元素,将其余元素放置在另一标记点上。

顺序改变:遍历数组,将指定元素与数组最后一个元素交换,同时缩短数组长度。

Code

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