LinkedLists Recommended Order by Topic Basic Linked List Questions Order Question Difficulty Votes 1 Design a Linked List Easy 2 Delete all occurrences of value in Linked List Easy 3 Swapping Nodes in a Linked List Medium 4 Add Two Numbers Medium 5 Reverse Linked List II Medium 6 Odd-Even linked List Medium 7 Merge K Sorted Lists Hard 8 Reverse Nodes in K Group Hard Linked List Variations Order Question Difficulty Votes 1 Doubly Linked List Easy 2 Flatten a Multilevel Doubly Linked List Medium Fast & Slow Pointers Order Question Difficulty Votes 1 Middle of Linked List Easy 2 Linked List Cycle Easy 3 Palindrome Linked List Easy 4 Remove Nth Node from End of List Medium 5 Reorder List Medium 6 Linked List Cycle II Medium Sentinel Nodes Order Question Difficulty Votes 1 Merge Two Sorted Lists Easy 2 Remove Duplicates from Sorted List II Medium