27. Remove Element 移除元素

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 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.


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

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

Difficulty: Easy


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