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128 problems

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Bit Manipulation Array1,196 Hash Table465 String434 Greedy327 Math327 Dynamic Programming324 Sorting300 Depth-First Search208 Binary Search187 Breadth-First Search165 Matrix163 Tree157 Prefix Sum153 Two Pointers148 Database135 All topics

Medium · With video · 128 results

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TitleSolutionAcceptDifficultyTopics

29. Divide Two IntegersVideo

Solution20.1%Medium

Bit Manipulation, Math· 8 companies

78. SubsetsVideo

Solution82.7%Medium

Array, Backtracking +1· 21 companies

89. Gray CodeVideo

Solution66.2%Medium

Backtracking, Bit Manipulation +1· 5 companies

90. Subsets IIVideo

Solution61.7%Medium

Array, Backtracking +1· 9 companies

137. Single Number IIVideo

Solution68.0%Medium

Array, Bit Manipulation· 5 companies

187. Repeated DNA SequencesVideo

Solution53.7%Medium

Bit Manipulation, Hash Function +4· 7 companies

201. Bitwise AND of Numbers RangeVideo

Solution49.4%Medium

Bit Manipulation· 5 companies

222. Count Complete Tree NodesVideo

Solution72.6%Medium

Binary Search, Binary Tree +2· 7 companies

260. Single Number IIIVideo

Solution70.2%Medium

Array, Bit Manipulation· 7 companies

287. Find the Duplicate NumberVideo

Solution64.7%Medium

Array, Binary Search +2· 22 companies

318. Maximum Product of Word LengthsVideo

Solution61.7%Medium

Array, Bit Manipulation +1· 2 companies

320. Generalized AbbreviationVideoPremium

Solution61.0%Medium

Backtracking, Bit Manipulation +1· 1 company

351. Android Unlock PatternsVideoPremium

Solution53.8%Medium

Backtracking, Bit Manipulation +2· 1 company

371. Sum of Two IntegersVideo

Solution55.9%Medium

Bit Manipulation, Math· 8 companies

393. UTF-8 ValidationVideo

Solution46.7%Medium

Array, Bit Manipulation· 4 companies

397. Integer ReplacementVideo

Solution37.9%Medium

Bit Manipulation, Dynamic Programming +2· 4 companies

421. Maximum XOR of Two Numbers in an ArrayVideo

Solution53.8%Medium

Array, Bit Manipulation +2· 5 companies

464. Can I WinVideo

Solution31.7%Medium

Bit Manipulation, Bitmask +4· 4 companies

473. Matchsticks to SquareVideo

Solution42.3%Medium

Array, Backtracking +3· 9 companies

477. Total Hamming DistanceVideo

Solution55.3%Medium

Array, Bit Manipulation +1· 3 companies

491. Non-decreasing SubsequencesVideo

Solution63.1%Medium

Array, Backtracking +2· 3 companies

526. Beautiful ArrangementVideo

Solution64.9%Medium

Array, Backtracking +3· 6 companies

638. Shopping OffersVideo

Solution52.9%Medium

Array, Backtracking +4· 6 companies

672. Bulb Switcher IIVideo

Solution51.2%Medium

Bit Manipulation, Breadth-First Search +2· 1 company

698. Partition to K Equal Sum SubsetsVideo

Solution38.6%Medium

Array, Backtracking +4· 8 companies

751. IP to CIDRVideoPremium

–53.7%Medium

Bit Manipulation, String· 4 companies

756. Pyramid Transition MatrixVideo

Solution60.6%Medium

Bit Manipulation, Breadth-First Search +1· 3 companies

779. K-th Symbol in GrammarVideo

Solution48.7%Medium

Bit Manipulation, Math +1· 7 companies

784. Letter Case PermutationVideo

Solution75.7%Medium

Backtracking, Bit Manipulation +1· 7 companies

861. Score After Flipping MatrixVideo

Solution80.3%Medium

Array, Bit Manipulation +2· 3 companies

898. Bitwise ORs of SubarraysVideo

Solution56.8%Medium

Array, Bit Manipulation +1· 7 companies

957. Prison Cells After N DaysVideo

Solution39.0%Medium

Array, Bit Manipulation +2· 1 company

1066. Campus Bikes IIVideoPremium

Solution55.9%Medium

Array, Backtracking +3· 1 company

1177. Can Make Palindrome from SubstringVideo

Solution42.0%Medium

Array, Bit Manipulation +3· 1 company

1238. Circular Permutation in Binary RepresentationVideo

Solution73.2%Medium

Backtracking, Bit Manipulation +1· 1 company

1239. Maximum Length of a Concatenated String with Unique CharactersVideo

Solution54.7%Medium

Array, Backtracking +2· 6 companies

1256. Encode NumberVideoPremium

Solution70.0%Medium

Bit Manipulation, Math +1· 1 company

1310. XOR Queries of a SubarrayVideo

Solution78.1%Medium

Array, Bit Manipulation +1· 3 companies

1318. Minimum Flips to Make a OR b Equal to cVideo

Solution71.9%Medium

Bit Manipulation· 2 companies

1371. Find the Longest Substring Containing Vowels in Even CountsVideo

Solution75.7%Medium

Bit Manipulation, Hash Table +2· 6 companies

1386. Cinema Seat AllocationVideo

Solution56.8%Medium

Array, Bit Manipulation +2· 5 companies

1404. Number of Steps to Reduce a Number in Binary Representation to OneVideo

Solution63.8%Medium

Bit Manipulation, String· 7 companies

1442. Count Triplets That Can Form Two Arrays of Equal XORVideo

Solution84.9%Medium

Array, Bit Manipulation +3· 2 companies

1457. Pseudo-Palindromic Paths in a Binary TreeVideo

Solution68.3%Medium

Binary Tree, Bit Manipulation +3· 2 companies

1461. Check If a String Contains All Binary Codes of Size KVideo

Solution61.5%Medium

Bit Manipulation, Hash Function +3· 5 companies

1506. Find Root of N-Ary TreeVideoPremium

Solution78.4%Medium

Bit Manipulation, Depth-First Search +2· 3 companies

1525. Number of Good Ways to Split a StringVideo

Solution68.2%Medium

Bit Manipulation, Dynamic Programming +2· 2 companies

1558. Minimum Numbers of Function Calls to Make Target ArrayVideo

Solution62.9%Medium

Array, Bit Manipulation +1· 1 company

1680. Concatenation of Consecutive Binary NumbersVideo

Solution66.6%Medium

Bit Manipulation, Math +1· 3 companies

1734. Decode XORed PermutationVideo

Solution67.0%Medium

Array, Bit Manipulation· 1 company

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