Package g1901_2000.s1920_build_array_from_permutation

Class Solution

java.lang.Object
g1901_2000.s1920_build_array_from_permutation.Solution
public class Solution extends java.lang.Object
1920 - Build Array from Permutation.

Easy

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 ).

Example 1:

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]

Example 2:

Input: nums = [5,0,1,2,3,4]

Output: [4,5,0,1,2,3]

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[5], nums[0], nums[1], nums[2], nums[3], nums[4]] = [4,5,0,1,2,3]

Constraints:

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

Follow-up: Can you solve it without using an extra space (i.e., O(1) memory)?

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int[]
    buildArray(int[] nums)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • buildArray

      public int[] buildArray(int[] nums)