Leetcode 27. Remove Element

Given an array nums and a value val, 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 by modifying the input array in-place with O(1) extra memory.

The order of elements can be changed. It doesn\'t matter what you leave beyond the new length.

Example 1:

Given nums = [3,2,2,3], val = 3,

Your function should return length = 2, with the first two elements of nums being 2.

It doesn\'t matter what you leave beyond the returned length.

Example 2:

Given nums = [0,1,2,2,3,0,4,2], val = 2, Your function should return length = 5, with the first five elements of nums containing 0, 1, 3, 0, and 4. Note that the order of those five elements can be arbitrary. It doesn\'t matter what values are set beyond the returned length.

题目链接：https://leetcode.com/problems/remove-element/

题目意思：把vector中等于val的元素删掉，并返回剩下元素个数

class Solution {
public:
    int removeElement(vector<int>& nums, int val) {
        if(nums.size()<1)
            return 0;
        for(int i=0;i<nums.size();)
        {
            if(nums[i]==val)
            {
                nums.erase(nums.begin()+i);
            }
            else
            {
                i++;
            }
        }
        return nums.size();
    }
};