删除数组中的重复元素

class Solution {
public:
    /**
     * @param A: a list of integers
     * @return : return an integer
     */
    int removeDuplicates(vector<int> &nums) {
        // write your code here
       if(nums.empty())
       {
           return 0;
       }
       int n=nums.size(),k=0;
       for(int i=1;i<n;++i)
       {
           if(nums[i]!=nums[k])
           {
               nums[++k] = nums[i];
           }
       }
         nums.resize(k+1); 
         return k+1; 
    }
};