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Problems

4,005 problems

Has videoPremium onlyReset
Array2,209String870Hash Table786Math682Dynamic Programming666Sorting504Greedy480Binary Search352Depth-First Search335Database303Bit Manipulation283Matrix278Tree261Breadth-First Search255Two Pointers249All topics

With video · 4,005 results

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TitleSolutionAcceptDifficultyTopics
401. Binary WatchVideo
Solution65.9%Easy
Backtracking, Bit Manipulation· 5 companies
402. Remove K DigitsVideo
Solution37.7%Medium
Greedy, Monotonic Stack +2· 21 companies
403. Frog JumpVideo
Solution47.8%Hard
Array, Dynamic Programming· 11 companies
404. Sum of Left LeavesVideo
Solution63.1%Easy
Binary Tree, Breadth-First Search +2· 6 companies
405. Convert a Number to HexadecimalVideo
Solution54.8%Easy
Bit Manipulation, Math· 6 companies
406. Queue Reconstruction by HeightVideo
Solution74.6%Medium
Array, Binary Indexed Tree +2· 5 companies
407. Trapping Rain Water IIVideo
Solution64.0%Hard
Array, Breadth-First Search +2· 14 companies
408. Valid Word AbbreviationVideoPremium
Solution37.0%Easy
String, Two Pointers· 7 companies
409. Longest PalindromeVideo
Solution55.9%Easy
Greedy, Hash Table +1· 8 companies
410. Split Array Largest SumVideo
Solution61.2%Hard
Array, Binary Search +3· 20 companies
411. Minimum Unique Word AbbreviationVideoPremium
–40.5%Hard
Array, Backtracking +2· 2 companies
412. Fizz BuzzVideo
Solution75.9%Easy
Math, Simulation +1· 18 companies
413. Arithmetic SlicesVideo
Solution65.0%Medium
Array, Dynamic Programming +1· 7 companies
414. Third Maximum NumberVideo
Solution40.3%Easy
Array, Sorting· 9 companies
415. Add StringsVideo
Solution52.1%Easy
Math, Simulation +1· 14 companies
416. Partition Equal Subset SumVideo
Solution49.9%Medium
Array, Dynamic Programming· 16 companies
417. Pacific Atlantic Water FlowVideo
Solution61.3%Medium
Array, Breadth-First Search +2· 11 companies
418. Sentence Screen FittingVideoPremium
Solution36.3%Medium
Array, Dynamic Programming +1· 1 company
419. Battleships in a BoardVideo
Solution77.4%Medium
Array, Depth-First Search +1· 8 companies
420. Strong Password CheckerVideo
Solution16.7%Hard
Greedy, Heap (Priority Queue) +1· 7 companies
421. Maximum XOR of Two Numbers in an ArrayVideo
Solution53.8%Medium
Array, Bit Manipulation +2· 5 companies
422. Valid Word SquareVideoPremium
Solution42.9%Easy
Array, Matrix· 1 company
423. Reconstruct Original Digits from EnglishVideo
Solution53.4%Medium
Hash Table, Math +1· 4 companies
424. Longest Repeating Character ReplacementVideo
Solution60.4%Medium
Hash Table, Sliding Window +1· 22 companies
425. Word SquaresVideoPremium
Solution54.7%Hard
Array, Backtracking +2· 1 company
426. Convert Binary Search Tree to Sorted Doubly Linked ListVideoPremium
Solution65.2%Medium
Binary Search Tree, Binary Tree +5· 4 companies
427. Construct Quad TreeVideo
Solution78.8%Medium
Array, Divide and Conquer +2· 8 companies
428. Serialize and Deserialize N-ary TreeVideoPremium
Solution68.7%Hard
Breadth-First Search, Depth-First Search +2· 7 companies
429. N-ary Tree Level Order TraversalVideo
Solution71.6%Medium
Breadth-First Search, Tree· 3 companies
430. Flatten a Multilevel Doubly Linked ListVideo
Solution63.3%Medium
Depth-First Search, Doubly-Linked List +1· 6 companies
431. Encode N-ary Tree to Binary TreeVideoPremium
Solution80.6%Hard
Binary Tree, Breadth-First Search +3
432. All O`one Data StructureVideo
Solution44.2%Hard
Design, Doubly-Linked List +2· 13 companies
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 companies
434. Number of Segments in a StringVideo
Solution37.6%Easy
String· 3 companies
435. Non-overlapping IntervalsVideo
Solution57.5%Medium
Array, Dynamic Programming +2· 18 companies
436. Find Right IntervalVideo
Solution56.7%Medium
Array, Binary Search +1· 4 companies
437. Path Sum IIIVideo
Solution46.6%Medium
Binary Tree, Depth-First Search +1· 11 companies
438. Find All Anagrams in a StringVideo
Solution54.7%Medium
Hash Table, Sliding Window +1· 15 companies
439. Ternary Expression ParserVideoPremium
Solution62.6%Medium
Recursion, Stack +1· 1 company
440. K-th Smallest in Lexicographical OrderVideo
Solution46.2%Hard
Trie· 7 companies
441. Arranging CoinsVideo
Solution48.7%Easy
Binary Search, Math· 6 companies
442. Find All Duplicates in an ArrayVideo
Solution76.8%Medium
Array, Hash Table· 11 companies
443. String CompressionVideo
Solution60.9%Medium
String, Two Pointers· 41 companies
444. Sequence ReconstructionVideoPremium
Solution31.2%Medium
Array, Graph +1· 2 companies
445. Add Two Numbers IIVideo
Solution63.1%Medium
Linked List, Math +1· 9 companies
446. Arithmetic Slices II - SubsequenceVideo
Solution55.1%Hard
Array, Dynamic Programming· 4 companies
447. Number of BoomerangsVideo
Solution58.0%Medium
Array, Hash Table +1· 2 companies
448. Find All Numbers Disappeared in an ArrayVideo
Solution64.4%Easy
Array, Hash Table· 7 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
450. Delete Node in a BSTVideo
Solution55.1%Medium
Binary Search Tree, Binary Tree +1· 11 companies
Showing 401–450 of 4,005