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Problems

57 problems

Has videoPremium onlyReset
Linked ListArray1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 57 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
24. Swap Nodes in PairsVideo
Solution70.3%Medium
Linked List, Recursion· 13 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
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
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
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
445. Add Two Numbers IIVideo
Solution63.1%Medium
Linked List, Math +1· 9 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
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
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
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
1265. Print Immutable Linked List in ReverseVideoPremium
Solution94.0%Medium
Linked List, Recursion +2
1367. Linked List in Binary TreeVideo
Solution52.1%Medium
Binary Tree, Depth-First Search +2· 5 companies
1472. Design Browser HistoryVideo
Solution78.3%Medium
Array, Data Stream +4· 13 companies
1634. Add Two Polynomials Represented as Linked ListsVideoPremium
Solution61.1%Medium
Linked List, Math +1· 1 company
1669. Merge In Between Linked ListsVideo
Solution82.9%Medium
Linked List· 11 companies
1670. Design Front Middle Back QueueVideo
Solution59.1%Medium
Array, Data Stream +3· 3 companies
1721. Swapping Nodes in a Linked ListVideo
Solution69.9%Medium
Linked List, Two Pointers· 6 companies
1797. Design Authentication ManagerVideo
Solution58.5%Medium
Design, Doubly-Linked List +2· 11 companies
1836. Remove Duplicates From an Unsorted Linked ListVideoPremium
Solution75.6%Medium
Hash Table, Linked List· 2 companies
2046. Sort Linked List Already Sorted Using Absolute ValuesVideoPremium
Solution67.1%Medium
Linked List, Sorting +1
2058. Find the Minimum and Maximum Number of Nodes Between Critical PointsVideo
Solution72.9%Medium
Linked List· 6 companies
2074. Reverse Nodes in Even Length GroupsVideo
Solution65.6%Medium
Linked List· 8 companies
2095. Delete the Middle Node of a Linked ListVideo
Solution60.4%Medium
Linked List, Two Pointers· 7 companies
2130. Maximum Twin Sum of a Linked ListVideo
Solution83.2%Medium
Linked List, Stack +1· 6 companies
2181. Merge Nodes in Between ZerosVideo
Solution89.8%Medium
Linked List, Simulation· 5 companies
2289. Steps to Make Array Non-decreasingVideo
Solution25.3%Medium
Array, Linked List +2· 1 company
Showing 1–50 of 57