Package g1001_1100.s1053_previous_permutation_with_one_swap

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    1053 - Previous Permutation With One Swap.

    Medium

    Given an array of positive integers arr (not necessarily distinct), return the lexicographically largest permutation that is smaller than arr, that can be made with exactly one swap. If it cannot be done, then return the same array.

    Note that a swap exchanges the positions of two numbers arr[i] and arr[j]

    Example 1:

    Input: arr = 3,2,1

    Output: 3,1,2

    Explanation: Swapping 2 and 1.

    Example 2:

    Input: arr = 1,1,5

    Output: 1,1,5

    Explanation: This is already the smallest permutation.

    Example 3:

    Input: arr = 1,9,4,6,7

    Output: 1,7,4,6,9

    Explanation: Swapping 9 and 7.

    Constraints:

    • <code>1 <= arr.length <= 10<sup>4</sup></code>

    • <code>1 <= arri<= 10<sup>4</sup></code>

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final IntArray prevPermOpt1(IntArray arr)

      • Methods inherited from class java.lang.Object

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