Package g0301_0400.s0397_integer_replacement

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    397 - Integer Replacement.

    Medium

    Given a positive integer n, you can apply one of the following operations:

    • If n is even, replace n with n / 2.

    • If n is odd, replace n with either n + 1 or n - 1.

    Return the minimum number of operations needed for n to become 1.

    Example 1:

    Input: n = 8

    Output: 3

    Explanation: 8 -> 4 -> 2 -> 1

    Example 2:

    Input: n = 7

    Output: 4

    Explanation: 7 -> 8 -> 4 -> 2 -> 1 or 7 -> 6 -> 3 -> 2 -> 1

    Example 3:

    Input: n = 4

    Output: 2

    Constraints:

    • <code>1 <= n <= 2<sup>31</sup> - 1</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 Integer integerReplacement(Integer n)

      • Methods inherited from class java.lang.Object

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