2505-bitwise-or-of-all-subsequence-sums

2505. Bitwise OR of All Subsequence Sums

Medium

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Given an integer array nums, return the value of the bitwise OR of the sum of all possible subsequences in the array.

A subsequence is a sequence that can be derived from another sequence by removing zero or more elements without changing the order of the remaining elements.

 

Example 1:

Input: nums = [2,1,0,3]
Output: 7
Explanation: All possible subsequence sums that we can have are: 0, 1, 2, 3, 4, 5, 6.
And we have 0 OR 1 OR 2 OR 3 OR 4 OR 5 OR 6 = 7, so we return 7.

Example 2:

Input: nums = [0,0,0]
Output: 0
Explanation: 0 is the only possible subsequence sum we can have, so we return 0.

 

Constraints:

• 1 <= nums.length <= 105
• 0 <= nums[i] <= 109