Leetcode-27 Remove Element

Posted 2020-08-20 北冥有鱼，南冥有猫

#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.

Hint:

1. Try two pointers.

题解：根据提示来做就好了。

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