leetcode26 C++ 20ms 删除排序数列中的重复元素

class Solution {
public:
int removeDuplicates(vector<int>& nums) {
    if(nums.empty()){
        return 0;
    }
    if(nums.size()==1){
        return 1 ;
    }
    int left = 0;
    int right = 1;
    int temp=0;
    while(right < nums.size()){
        while(nums[left] == nums[right]){
            right++;
            if(right==nums.size()){
                return left+1;
            }
        }
        left++;
        temp = nums[left];
        nums[left] = nums[right];
        nums[right] = temp;
        right++;
    }
    return left+1;
}
};