g0301_0400.s0397_integer_replacement

Class Solution

java.lang.Object

g0301_0400.s0397_integer_replacement.Solution

public class Solution
extends 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 and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	integerReplacement(int n)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

integerReplacement

public int integerReplacement(int n)