Package g0301_0400.s0397_integer_replacement

Class Solution

java.lang.Object
g0301_0400.s0397_integer_replacement.Solution
public class Solution extends java.lang.Object
397 - Integer Replacement.

Medium

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

  1. If n is even, replace n with n / 2.
  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:

  • 1 <= n <= 231 - 1

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    integerReplacement(int n)
     

    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

    • integerReplacement

      public int integerReplacement(int n)