LeetCode-27:Remove Element

原题描述如下:

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 ofnums being 2.

题意：给定一个数组和数字，从该数组中将该数字移除，并返回移除之后数组的长度。

解题思路：动

Java代码：

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