1920. Build Array from Permutation

Given a zero-based permutation nums (0-indexed), build an array ans of the same length where ans[i] = nums[nums[i]] for each 0 <= i < nums.length and return it.

A zero-based permutation nums is an array of distinct integers from 0 to nums.length - 1 (inclusive).

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