27.Remove Element

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.

删除数组中和给定值相等的元素，返回删除后的数组和数组长度。

这道题用遍历即可，见代码:

class Solution {
public:
    int removeElement(vector<int>& nums, int val) {
        int new_len=0,i=0,size=nums.size();
        for(i=0;i<nums.size();i++){
            if(nums[i]!=val){
                nums[new_len++]=nums[i];
            }
        }
        return new_len;
    }
};