📝 **Task:** Write `merge_k_sorted(lists)` that merges K sorted lists into one sorted list. Print `merge_k_sorted([[1,4,5],[1,3,4],[2,6]])`. Expected: [1, 1, 2, 3, 4, 4, 5, 6] 📋 Edit the starter code. Tests run automatically. 💡 **Hint:** Re-read the theory if stuck.