LeetCode——027

/*
27. Remove Element My Submissions QuestionEditorial Solution
Total Accepted: 112934 Total Submissions: 335498 Difficulty: Easy
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.

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*/

/*
解題思路：
此題與上一題很類似，使用雙指針法。甚至比上一題還要簡單，沒什麼可說的。
*/

class Solution {
public:
    int removeElement(vector<int>& nums, int val) {

        int index=0;
        for(auto a: nums){

            if(a!=val){
                nums[index++]=a;
            }
        }
        nums.resize(index);
        return index;
    }
};