23. Merge k Sorted Lists — divide & conquer pairwise merge.

Use the tabs to read the prompt, implementation, and tests separately. Syntax uses Shiki; tests can be executed on the server with node --test.

Same file as in the repo · ~20s timeout

From file header (JSDoc)

23. Merge k Sorted Lists — divide & conquer pairwise merge.
@param {(import('../../lib/list-node.js').ListNode | null)[]} lists
@returns {import('../../lib/list-node.js').ListNode | null}