1920_BuildArrayfromPermutation

---

title: 1920. Build Array from Permutation categories: leetcode comments: false

problem

solution

option 1

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

option 2 - follow up O(1) space

analysis

• time complexity O(n)
• space complexity O(n)