027. Remove Element

 1 class Solution {
 2 public:
 3     int removeElement(vector<int>& nums, int val) {
 4         if (nums.size() == 0) return 0;
 5         else {
 6             int index = 0;
 7             for (int i = 0; i < nums.size(); ++i) {
 8                 if (nums[i] != val) {
 9                     nums[index++] = nums[i];
10                 }
11             }
12             return index;
13         }
14     }
15 };