力扣-268 丢失的数字

AC Code

class Solution {
public:
    int missingNumber(vector<int>& nums) {
        int n = nums.size();
        sort(nums.begin(),nums.end());
        int i = 0;
        for(;i<n;i++)
            if(i!=nums[i]) return i;
        return i;
    }
};