Given an array of integers nums and an integer k, return the number of subarrays of nums where the bitwise AND of the elements of the subarray equals k.
\n
Example 1:
\n\nInput: nums = [1,1,1], k = 1
\n\nOutput: 6
\n\nExplanation:
\n\nAll subarrays contain only 1's.
\nExample 2:
\n\nInput: nums = [1,1,2], k = 1
\n\nOutput: 3
\n\nExplanation:
\n\nSubarrays having an AND value of 1 are: [1,1,2], [1,1,2], [1,1,2].
Example 3:
\n\nInput: nums = [1,2,3], k = 2
\n\nOutput: 2
\n\nExplanation:
\n\nSubarrays having an AND value of 2 are: [1,2,3], [1,2,3].
\n
Constraints:
\n\n1 <= nums.length <= 1050 <= nums[i], k <= 109(l, r) such that nums[l] & nums[l + 1] & … & nums[r] == k.",
"Fix the left index l.",
"Note that if you increase r for a fixed l, then the AND value of the subarray either decreases or remains unchanged.",
"Therefore, consider using binary search.",
"To calculate the AND value of a subarray, use sparse tables."
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