Merge K sorted list - can't create empty ListNode - defaults to [0]
Creating an empty ListNode seems to default to [0] which breaks one of the test cases in javascript.
new ListNode(null) === [0]test case requires the answer to be []
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Creating an empty ListNode seems to default to [0] which breaks one of the test cases in javascript.
new ListNode(null) === [0]test case requires the answer to be []