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Problems

81 problems

Has videoPremium onlyReset
Linked ListArray2,237String877Hash Table797Math691Dynamic Programming673Sorting508Greedy485Binary Search357Depth-First Search338Database308Bit Manipulation286Matrix279Tree264Breadth-First Search257Prefix Sum252All topics

81 results

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TitleSolutionAcceptDifficultyTopics
2. Add Two NumbersVideo
Solution49.3%Medium
Linked List, Math +1· 37 companies
19. Remove Nth Node From End of ListVideo
Solution52.4%Medium
Linked List, Two Pointers· 18 companies
21. Merge Two Sorted ListsVideo
Solution68.7%Easy
Linked List, Recursion· 36 companies
23. Merge k Sorted ListsVideo
Solution60.3%Hard
Divide and Conquer, Heap (Priority Queue) +2· 50 companies
24. Swap Nodes in PairsVideo
Solution70.3%Medium
Linked List, Recursion· 13 companies
25. Reverse Nodes in k-GroupVideo
Solution67.4%Hard
Linked List, Recursion· 27 companies
61. Rotate ListVideo
Solution43.1%Medium
Linked List, Two Pointers· 9 companies
82. Remove Duplicates from Sorted List IIVideo
Solution52.8%Medium
Linked List, Two Pointers· 11 companies
83. Remove Duplicates from Sorted ListVideo
Solution57.6%Easy
Linked List· 9 companies
86. Partition ListVideo
Solution62.0%Medium
Linked List, Two Pointers· 5 companies
92. Reverse Linked List IIVideo
Solution52.4%Medium
Linked List· 16 companies
109. Convert Sorted List to Binary Search TreeVideo
Solution67.4%Medium
Binary Search Tree, Binary Tree +3· 9 companies
114. Flatten Binary Tree to Linked ListVideo
Solution71.6%Medium
Binary Tree, Depth-First Search +3· 8 companies
116. Populating Next Right Pointers in Each NodeVideo
Solution67.6%Medium
Binary Tree, Breadth-First Search +3· 8 companies
117. Populating Next Right Pointers in Each Node IIVideo
Solution57.9%Medium
Binary Tree, Breadth-First Search +3· 7 companies
138. Copy List with Random PointerVideo
Solution63.8%Medium
Hash Table, Linked List· 22 companies
141. Linked List CycleVideo
Solution55.2%Easy
Hash Table, Linked List +1· 24 companies
142. Linked List Cycle IIVideo
Solution59.3%Medium
Hash Table, Linked List +1· 13 companies
143. Reorder ListVideo
Solution66.0%Medium
Linked List, Recursion +2· 15 companies
146. LRU CacheVideo
Solution48.2%Medium
Design, Doubly-Linked List +2· 120 companies
147. Insertion Sort ListVideo
Solution60.5%Medium
Linked List, Sorting· 5 companies
148. Sort ListVideo
Solution65.2%Medium
Divide and Conquer, Linked List +3· 9 companies
160. Intersection of Two Linked ListsVideo
Solution64.6%Easy
Hash Table, Linked List +1· 13 companies
203. Remove Linked List ElementsVideo
Solution55.3%Easy
Linked List, Recursion· 9 companies
206. Reverse Linked ListVideo
Solution81.0%Easy
Linked List, Recursion· 34 companies
234. Palindrome Linked ListVideo
Solution58.8%Easy
Linked List, Recursion +2· 17 companies
237. Delete Node in a Linked ListVideo
Solution84.3%Medium
Linked List· 10 companies
328. Odd Even Linked ListVideo
Solution62.4%Medium
Linked List· 12 companies
355. Design TwitterVideo
Solution45.6%Medium
Design, Hash Table +2· 14 companies
369. Plus One Linked ListVideoPremium
Solution61.1%Medium
Linked List, Math· 2 companies
379. Design Phone DirectoryVideoPremium
Solution53.3%Medium
Array, Design +3· 1 company
382. Linked List Random NodeVideo
Solution65.3%Medium
Linked List, Math +2· 3 companies
426. Convert Binary Search Tree to Sorted Doubly Linked ListVideoPremium
Solution65.2%Medium
Binary Search Tree, Binary Tree +5· 4 companies
430. Flatten a Multilevel Doubly Linked ListVideo
Solution63.3%Medium
Depth-First Search, Doubly-Linked List +1· 6 companies
432. All O`one Data StructureVideo
Solution44.2%Hard
Design, Doubly-Linked List +2· 13 companies
445. Add Two Numbers IIVideo
Solution63.1%Medium
Linked List, Math +1· 9 companies
460. LFU CacheVideo
Solution50.0%Hard
Design, Doubly-Linked List +2· 32 companies
622. Design Circular QueueVideo
Solution55.4%Medium
Array, Design +2· 21 companies
641. Design Circular DequeVideo
Solution65.2%Medium
Array, Design +2· 5 companies
705. Design HashSetVideo
Solution67.9%Easy
Array, Design +3· 6 companies
706. Design HashMapVideo
Solution66.5%Easy
Array, Design +3· 13 companies
707. Design Linked ListVideo
Solution30.6%Medium
Design, Linked List· 6 companies
708. Insert into a Sorted Circular Linked ListVideoPremium
Solution38.5%Medium
Linked List· 4 companies
716. Max StackVideoPremium
Solution45.9%Hard
Design, Doubly-Linked List +3· 10 companies
725. Split Linked List in PartsVideo
Solution70.6%Medium
Linked List· 5 companies
817. Linked List ComponentsVideo
Solution58.4%Medium
Array, Hash Table +1· 4 companies
876. Middle of the Linked ListVideo
Solution82.3%Easy
Linked List, Two Pointers· 13 companies
1019. Next Greater Node In Linked ListVideo
Solution64.6%Medium
Array, Linked List +2· 4 companies
1171. Remove Zero Sum Consecutive Nodes from Linked ListVideo
Solution53.3%Medium
Hash Table, Linked List· 6 companies
1206. Design SkiplistVideo
Solution59.7%Hard
Design, Linked List· 8 companies
Showing 1–50 of 81