📄️ 🟩 Reverse Linked List (#206)206)📄️ 🟩 Merge Two Sorted Lists (#21)21)📄️ 🟩 Linked List Cycle (#141)141)📄️ 🟨 Reorder List (#143)143)📄️ 🟨 Remove Nth Node From End of List (#19)19)📄️ 🟥 Merge k Sorted Lists (#23)23)