Coding Test/LeetCode

[LeetCode] 1920. Build Array from Permutation c++

owls 2022. 9. 14. 10:36
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문제 설명

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.

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

 

제한 사항

  • 1 <= nums.length <= 1000
  • 0 <= nums[i] < nums.length
  • The elements in nums are distinct.

입출력 예

Input: nums = [0,2,1,5,3,4]
Output: [0,1,2,4,5,3]
Explanation: The array ans is built as follows: 
ans = [nums[nums[0]], nums[nums[1]], nums[nums[2]], nums[nums[3]], nums[nums[4]], nums[nums[5]]]
    = [nums[0], nums[2], nums[1], nums[5], nums[3], nums[4]]
    = [0,1,2,4,5,3]

풀이

nums 배열 원소를 index로 접근하여 결과 값을 얻는 문제이다.

class Solution {
public:
    vector<int> buildArray(vector<int>& nums) {
        vector<int> ans;    
        for(const auto &it : nums){
            ans.push_back(nums[it]);
        }     
        return ans;
    }
};

 

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