Leetcode 27 Remove Element STL

和remove zero类似的方法完成该题

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