C++ 代码

class Solution {
public:
    int getMissingNumber(vector<int>& nums) {
        int size=nums.size();
        if(size==0) return 0;
        int t=0;
        int i=0;
        while(i<size){
            if(nums[i]==t){
                while(nums[i]==t) i++;
                t++;
            }
            else{
                break;
            }
        }
        return t;
    }
};