We have an array A of non-negative integers.
For every (contiguous) subarray B = [A[i], A[i+1], ..., A[j]] (with i
<= j), we take the bitwise OR of all the elements in B, obtaining a
result A[i] | A[i+1] | ... | A[j].
Return the number of possible results. (Results that occur more than once are only counted once in the final answer.)
Example 1:
Input: [0] Output: 1 Explanation: There is only one possible result: 0.
Example 2:
Input: [1,1,2] Output: 3 Explanation: The possible subarrays are [1], [1], [2], [1, 1], [1, 2], [1, 1, 2]. These yield the results 1, 1, 2, 1, 3, 3. There are 3 unique values, so the answer is 3.
Example 3:
Input: [1,2,4] Output: 6 Explanation: The possible results are 1, 2, 3, 4, 6, and 7.