2419. Longest Subarray With Maximum Bitwise AND

Problem Link

Description

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You are given an integer array nums of size n.

Consider a non-empty subarray from nums that has the maximum possible bitwise AND.

• In other words, let k be the maximum value of the bitwise AND of any subarray of nums. Then, only subarrays with a bitwise AND equal to k should be considered.

Return the length of the longest such subarray.

The bitwise AND of an array is the bitwise AND of all the numbers in it.

A subarray is a contiguous sequence of elements within an array.

 

Example 1:

Input: nums = [1,2,3,3,2,2]
Output: 2
Explanation:
The maximum possible bitwise AND of a subarray is 3.
The longest subarray with that value is [3,3], so we return 2.

Example 2:

Input: nums = [1,2,3,4]
Output: 1
Explanation:
The maximum possible bitwise AND of a subarray is 4.
The longest subarray with that value is [4], so we return 1.

 

Constraints:

• 1 <= nums.length <= 105
• 1 <= nums[i] <= 106

Solution

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Python3

class Solution:
    def longestSubarray(self, nums: List[int]) -> int:
        mmax = max(nums)
        res = curr = 0
 
        for x in nums:
            if x == mmax:
                curr += 1
                res = max(res, curr)
            else:
                curr = 0
        
        return res