27. Remove Element

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.

题目分析

要求移除指定元素，空间复杂度为O(1)。

代码实现

public int RemoveElement(int[] nums, int val)    {        int i=0; //指向不等于元素val        for(int j=0; j<nums.Length;j++)        {            while(j<nums.Length&&nums[j]==val)                j++;            if(i<j && j<nums.Length)              nums[i]= nums[j];            if(j<nums.Length)              i++;        }        return i;    }

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