Package g2001_2100.s2044_count_number_of_maximum_bitwise_or_subsets

Class Solution

java.lang.Object

g2001_2100.s2044_count_number_of_maximum_bitwise_or_subsets.Solution

public class Solution
extends Object

2044 - Count Number of Maximum Bitwise-OR Subsets.

Medium

Given an integer array nums, find the maximum possible bitwise OR of a subset of nums and return the number of different non-empty subsets with the maximum bitwise OR.

An array a is a subset of an array b if a can be obtained from b by deleting some (possibly zero) elements of b. Two subsets are considered different if the indices of the elements chosen are different.

The bitwise OR of an array a is equal to a[0] **OR** a[1] **OR** ... **OR** a[a.length - 1] ( 0-indexed ).

Example 1:

Input: nums = [3,1]

Output: 2

Explanation: The maximum possible bitwise OR of a subset is 3. There are 2 subsets with a bitwise OR of 3:

• [3]

• [3,1]

Example 2:

Input: nums = [2,2,2]

Output: 7

Explanation: All non-empty subsets of [2,2,2] have a bitwise OR of 2. There are 2³ - 1 = 7 total subsets.

Example 3:

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

Output: 6

Explanation: The maximum possible bitwise OR of a subset is 7. There are 6 subsets with a bitwise OR of 7:

• [3,5]

• [3,1,5]

• [3,2,5]

• [3,2,1,5]

• [2,5]

• [2,1,5]

Constraints:

• 1 <= nums.length <= 16
• 1 <= nums[i] <= 105

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

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

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

countMaxOrSubsets

public int countMaxOrSubsets(int[] nums)