Leetcode27. Remove Element

一、原题

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 in place with constant memory.

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

Example:
Given input array nums = [3,2,2,3], val = 3

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

二、思路

要求：从数组中除去指定的元素，要求不能占据额外的空间。

使用两个指针，来标记数组，没有出现目标元素，则两者都往后移；

三、代码

public class Solution {    public int removeElement(int[] nums, int val) {        int j=0;        for(int i=0;i<nums.length;i++)        {            if(nums[i]!=val)            {            nums[j]=nums[i];            j++;            }        }        return j;            }}

原题地址