C++ 代码

class Solution {
public:
    int getNumberSameAsIndex(vector<int>& nums) {
        if (nums.size()==0) return -1;
        bool flag= false;
        int res = -1;
        for(int i=0;i<nums.size();i++){
            if (nums[i] < 0) continue;
            else if(nums[i] == i) {
                flag = true;
                res = i;
            }
        }
        if(flag) return res;
        else{
            return -1;
        }
    }
};