Recognition signal
When should you think of Linked List?
The problem is about rearranging, locating, or comparing nodes without random access.
24 worked problems
Linked List
Pointer surgery on chained nodes. The problem is about rearranging, locating, or comparing nodes without random access.
Core invariant
What must stay true?
Every pointer update preserves access to the unprocessed remainder of the list.
Practice in a deliberate order
Starter
Build the template
Core
Recognize variations
Stretch
Combine ideas under pressure
What to learn in this cluster
- 01Linear pointer walks
- 02Fast and slow pointers
- 03In-place reversal and list surgery
All Linked List problems
24 of 24 walkthroughsNo matching problems. Try another title, tag, or difficulty.
- #21 Merge Two Sorted Listslinked-list · recursionEasy
- #83 Remove Duplicates from Sorted Listlinked-listEasy
- #141 Linked List Cyclelinked-list · two-pointers · floydEasy
- #203 Remove Linked List Elementslinked-list · two-pointersEasy
- #206 Reverse Linked Listlinked-list · recursionEasy
- #876 Middle of the Linked Listlinked-list · two-pointersEasy
- #2 Add Two Numberslinked-list · math · recursionMedium
- #19 Remove Nth Node From End of Listlinked-list · two-pointersMedium
- #24 Swap Nodes in Pairslinked-list · recursionMedium
- #61 Rotate Listlinked-list · two-pointersMedium
- #86 Partition Listlinked-list · two-pointersMedium
- #138 Copy List with Random Pointerlinked-list · hash-tableMedium
- #142 Linked List Cycle IIlinked list · two pointers · floydMedium
- #143 Reorder Listlinked-list · two-pointers · reversalMedium
- #146 LRU Cachedesign · hash-table · doubly-linked-listMedium
- #147 Insertion Sort Listlinked-list · sortingMedium
- #148 Sort Listlinked-list · sorting · merge-sortMedium
- #160 Intersection of Two Linked Listslinked-list · two-pointersMedium
- #234 Palindrome Linked Listlinked list · two pointers · stackMedium
- #237 Delete Node in a Linked Listlinked-listMedium
- #328 Odd Even Linked Listlinked-list · two-pointersMedium
- #25 Reverse Nodes in k-Grouplinked-list · recursionHard
- #430 Flatten a Multilevel Doubly Linked Listlinked-list · dfs · stackHard
- #460 LFU Cachedesign · hash-table · lfuHard
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