删除排序数组中的重复项

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        int i=0;
        int j=0;
        while(j < nums.size()) {
            auto e = nums[j++];            
            if(i ==0 || nums[i-1] != e ) {
                nums[i] = e;
                i++;
            }            
        }        
        return i;
    }
};