Leetcode - 1920 Build Array from Permutation

class Solution {
public:
    vector<int> buildArray(vector<int>& nums) {
        int length = nums.size();
        vector <int> result;
        for (int i = 0 ; i < length ; i++){
            result.push_back(nums[nums[i]]);
        }
        return result;
    }
};