Skip to content

For employers Sign in

Make and follow sheets.Sign in

Problems

116 problems

Has video Premium only Reset

Array301 Database212 Hash Table116 String116 Depth-First Search78 Math78 Dynamic Programming76 Sorting64 Tree63 Breadth-First Search53 Greedy52 Binary Search50 Binary Tree48 Two Pointers40 Matrix39 All topics

Premium · 116 results

Sign in to see which of these you have solved.Sign in

TitleSolutionAcceptDifficultyTopics

1087. Brace ExpansionVideoPremium

Solution66.5%Medium

Backtracking, Breadth-First Search +1· 6 companies

1100. Find K-Length Substrings With No Repeated CharactersVideoPremium

Solution76.5%Medium

Hash Table, Sliding Window +1· 1 company

1119. Remove Vowels from a StringVideoPremium

Solution91.2%Easy

String· 1 company

1153. String Transforms Into Another StringVideoPremium

Solution34.9%Hard

Hash Table, String· 1 company

1165. Single-Row KeyboardVideoPremium

Solution87.6%Easy

Hash Table, String· 1 company

1166. Design File SystemVideoPremium

Solution65.1%Medium

Design, Hash Table +2· 12 companies

1180. Count Substrings with Only One Distinct LetterVideoPremium

Solution80.9%Easy

Math, String· 1 company

1181. Before and After PuzzleVideoPremium

Solution51.8%Medium

Array, Hash Table +2· 1 company

1216. Valid Palindrome IIIVideoPremium

Solution49.2%Hard

Dynamic Programming, String· 3 companies

1236. Web CrawlerVideoPremium

Solution68.8%Medium

Breadth-First Search, Depth-First Search +2· 7 companies

1256. Encode NumberVideoPremium

Solution70.0%Medium

Bit Manipulation, Math +1· 1 company

1257. Smallest Common RegionVideoPremium

Solution68.6%Medium

Array, Breadth-First Search +4· 1 company

1258. Synonymous SentencesVideoPremium

Solution57.2%Medium

Array, Backtracking +3· 3 companies

1271. HexspeakVideoPremium

Solution57.5%Easy

Math, String· 1 company

1427. Perform String ShiftsVideoPremium

Solution56.0%Easy

Array, Math +1· 1 company

1554. Strings Differ by One CharacterVideoPremium

Solution39.4%Medium

Hash Function, Hash Table +2· 1 company

1597. Build Binary Expression Tree From Infix ExpressionVideoPremium

–62.5%Hard

Binary Tree, Stack +2· 1 company

1618. Maximum Font to Fit a Sentence in a ScreenVideoPremium

Solution62.0%Medium

Array, Binary Search +2· 1 company

1682. Longest Palindromic Subsequence IIVideoPremium

Solution50.1%Medium

Dynamic Programming, String

1698. Number of Distinct Substrings in a StringVideoPremium

Solution64.4%Medium

Hash Function, Rolling Hash +3· 4 companies

1772. Sort Features by PopularityVideoPremium

Solution66.4%Medium

Array, Hash Table +2· 1 company

1794. Count Pairs of Equal Substrings With Minimum DifferenceVideoPremium

Solution62.7%Medium

Greedy, Hash Table +1· 1 company

1804. Implement Trie II (Prefix Tree)VideoPremium

Solution63.6%Medium

Design, Hash Table +2· 2 companies

1842. Next Palindrome Using Same DigitsVideoPremium

Solution54.2%Hard

String, Two Pointers· 1 company

1933. Check if String Is Decomposable Into Value-Equal SubstringsVideoPremium

Solution50.4%Easy

2067. Number of Equal Count SubstringsVideoPremium

Solution45.1%Medium

Counting, Prefix Sum +1· 1 company

2083. Substrings That Begin and End With the Same LetterVideoPremium

Solution74.1%Medium

Counting, Hash Table +3

2168. Unique Substrings With Equal Digit FrequencyVideoPremium

Solution64.6%Medium

Counting, Hash Function +3· 1 company

2268. Minimum Number of KeypressesVideoPremium

Solution71.2%Medium

Counting, Greedy +3· 1 company

2330. Valid Palindrome IVVideoPremium

Solution75.8%Medium

String, Two Pointers· 2 companies

2408. Design SQLVideoPremium

Solution63.9%Medium

Array, Design +2· 2 companies

2450. Number of Distinct Binary Strings After Applying OperationsVideoPremium

Solution63.0%Medium

Math, String· 1 company

2489. Number of Substrings With Fixed RatioVideoPremium

Solution56.0%Medium

Hash Table, Math +2· 1 company

2539. Count the Number of Good SubsequencesVideoPremium

Solution47.7%Medium

Combinatorics, Counting +3· 4 companies

2590. Design a Todo ListVideoPremium

Solution59.8%Medium

Array, Design +3· 1 company

2743. Count Substrings Without Repeating CharacterVideoPremium

Solution75.9%Medium

Hash Table, Sliding Window +1· 1 company

2802. Find The K-th Lucky NumberVideoPremium

Solution76.1%Medium

Bit Manipulation, Math +1

2868. The Wording GamePremium

Solution53.6%Hard

Array, Game Theory +4

2950. Number of Divisible SubstringsVideoPremium

Solution74.6%Medium

Counting, Hash Table +2· 4 companies

2955. Number of Same-End SubstringsVideoPremium

Solution60.6%Medium

Array, Counting +3· 2 companies

3078. Match Alphanumerical Pattern in Matrix IVideoPremium

Solution64.6%Medium

Array, Hash Table +2· 2 companies

3088. Make String Anti-palindromeVideoPremium

Solution46.6%Hard

Counting Sort, Greedy +2· 1 company

3104. Find Longest Self-Contained SubstringVideoPremium

Solution58.6%Hard

Binary Search, Hash Table +2· 1 company

3119. Maximum Number of Potholes That Can Be FixedVideoPremium

Solution53.3%Medium

Greedy, Sorting +1· 2 companies

3125. Maximum Number That Makes Result of Bitwise AND ZeroVideoPremium

Solution70.0%Medium

Greedy, Sorting +1· 1 company

3135. Equalize Strings by Adding or Removing Characters at EndsVideoPremium

Solution56.8%Medium

Binary Search, Dynamic Programming +3· 1 company

3167. Better Compression of StringVideoPremium

Solution75.3%Medium

Counting, Hash Table +2· 2 companies

3279. Maximum Total Area Occupied by PistonsVideoPremium

Solution41.3%Hard

Array, Counting +4

3329. Count Substrings With K-Frequency Characters IIVideoPremium

Solution72.2%Hard

Hash Table, Sliding Window +1

3406. Find the Lexicographically Largest String From the Box IIVideoPremium

Solution48.9%Hard

String, Two Pointers

Showing 51–100 of 116