题目描述
- 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.
- Examlple :
Given nums = [3,2,2,3], val = 3,
Your function should return length = 2, with the first two elements of nums being 2.
代码实现
class Solution{public: int removeElement(vector<int>& nums, int val){int n = nums.size();int i, j;i = j = 0;while(i < n){if(nums[i] == val){i++;} else {nums[j++] = nums[i++]; } }return j;}};