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Array1,212 Hash Table473 String437 Math331 Greedy330 Dynamic Programming327 Sorting302 Depth-First Search208 Binary Search189 Breadth-First Search166 Matrix163 Tree158 Prefix Sum155 Two Pointers150 Database137 All topics

Medium · 473 results

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TitleSolutionAcceptDifficultyTopics

1679. Max Number of K-Sum PairsVideo

Solution57.5%Medium

Array, Hash Table +2· 7 companies

1695. Maximum Erasure ValueVideo

Solution64.2%Medium

Array, Hash Table +1· 7 companies

1711. Count Good MealsVideo

Solution33.3%Medium

Array, Hash Table· 4 companies

1726. Tuple with Same ProductVideo

Solution70.1%Medium

Array, Counting +1· 5 companies

1733. Minimum Number of People to TeachVideo

Solution67.7%Medium

Array, Greedy +1· 4 companies

1737. Change Minimum Characters to Satisfy One of Three ConditionsVideo

Solution38.4%Medium

Counting, Hash Table +2· 1 company

1740. Find Distance in a Binary TreeVideoPremium

Solution74.3%Medium

Binary Tree, Breadth-First Search +3· 2 companies

1743. Restore the Array From Adjacent PairsVideo

Solution74.7%Medium

Array, Depth-First Search +1· 9 companies

1756. Design Most Recently Used QueueVideoPremium

Solution78.0%Medium

Array, Binary Indexed Tree +4· 2 companies

1772. Sort Features by PopularityVideoPremium

Solution66.4%Medium

Array, Hash Table +2· 1 company

1775. Equal Sum Arrays With Minimum Number of OperationsVideo

Solution54.6%Medium

Array, Counting +2· 1 company

1781. Sum of Beauty of All SubstringsVideo

Solution74.9%Medium

Counting, Hash Table +1· 6 companies

1794. Count Pairs of Equal Substrings With Minimum DifferenceVideoPremium

Solution62.7%Medium

Greedy, Hash Table +1· 1 company

1797. Design Authentication ManagerVideo

Solution58.5%Medium

Design, Doubly-Linked List +2· 11 companies

1804. Implement Trie II (Prefix Tree)VideoPremium

Solution63.6%Medium

Design, Hash Table +2· 2 companies

1807. Evaluate the Bracket Pairs of a StringVideo

Solution80.8%Medium

Array, Hash Table +1· 2 companies

1814. Count Nice Pairs in an ArrayVideo

Solution48.6%Medium

Array, Counting +2· 6 companies

1817. Finding the Users Active MinutesVideo

Solution81.0%Medium

Array, Hash Table· 2 companies

1836. Remove Duplicates From an Unsorted Linked ListVideoPremium

Solution75.6%Medium

Hash Table, Linked List· 2 companies

1852. Distinct Numbers in Each SubarrayVideoPremium

Solution77.3%Medium

Array, Hash Table +1· 1 company

1865. Finding Pairs With a Certain SumVideo

Solution61.6%Medium

Array, Design +1· 8 companies

1906. Minimum Absolute Difference QueriesVideo

Solution46.4%Medium

Array, Hash Table· 1 company

1915. Number of Wonderful SubstringsVideo

Solution66.8%Medium

Bit Manipulation, Hash Table +2· 2 companies

1930. Unique Length-3 Palindromic SubsequencesVideo

Solution73.8%Medium

Bit Manipulation, Hash Table +2· 6 companies

1940. Longest Common Subsequence Between Sorted ArraysVideoPremium

Solution81.3%Medium

Array, Counting +1· 1 company

1942. The Number of the Smallest Unoccupied ChairVideo

Solution60.3%Medium

Array, Hash Table +1· 5 companies

1943. Describe the PaintingVideo

Solution53.3%Medium

Array, Hash Table +2· 3 companies

1980. Find Unique Binary StringVideo

Solution81.2%Medium

Array, Backtracking +2· 5 companies

1983. Widest Pair of Indices With Equal Range SumVideoPremium

Solution54.0%Medium

Array, Hash Table +1· 1 company

1993. Operations on TreeVideo

Solution46.3%Medium

Array, Breadth-First Search +4· 3 companies

2001. Number of Pairs of Interchangeable RectanglesVideo

Solution53.1%Medium

Array, Counting +3· 2 companies

2007. Find Original Array From Doubled ArrayVideo

Solution41.0%Medium

Array, Greedy +2· 6 companies

2008. Maximum Earnings From TaxiVideo

Solution46.9%Medium

Array, Binary Search +3· 8 companies

2013. Detect SquaresVideo

Solution53.0%Medium

Array, Counting +2· 4 companies

2023. Number of Pairs of Strings With Concatenation Equal to TargetVideo

Solution75.6%Medium

Array, Counting +2· 2 companies

2034. Stock Price Fluctuation Video

Solution49.1%Medium

Data Stream, Design +3· 6 companies

2043. Simple Bank SystemVideo

Solution69.7%Medium

Array, Design +2· 20 companies

2080. Range Frequency QueriesVideo

Solution44.3%Medium

Array, Binary Search +3· 2 companies

2083. Substrings That Begin and End With the Same LetterVideoPremium

Solution74.1%Medium

Counting, Hash Table +3

2107. Number of Unique Flavors After Sharing K CandiesVideoPremium

Solution62.4%Medium

Array, Hash Table +1· 2 companies

2115. Find All Possible Recipes from Given SuppliesVideo

Solution56.8%Medium

Array, Graph +3· 10 companies

2121. Intervals Between Identical ElementsVideo

Solution48.4%Medium

Array, Hash Table +1· 2 companies

2131. Longest Palindrome by Concatenating Two Letter WordsVideo

Solution53.5%Medium

Array, Counting +3· 6 companies

2135. Count Words Obtained After Adding a LetterVideo

Solution44.0%Medium

Array, Bit Manipulation +3· 1 company

2150. Find All Lonely Numbers in the ArrayVideo

Solution64.0%Medium

Array, Counting +1· 2 companies

2152. Minimum Number of Lines to Cover PointsVideoPremium

Solution42.9%Medium

Array, Backtracking +6· 1 company

2166. Design BitsetVideo

Solution32.7%Medium

Array, Design +2

2168. Unique Substrings With Equal Digit FrequencyVideoPremium

Solution64.6%Medium

Counting, Hash Function +3· 1 company

2170. Minimum Operations to Make the Array AlternatingVideo

Solution35.7%Medium

Array, Counting +2· 2 companies

2182. Construct String With Repeat LimitVideo

Solution70.9%Medium

Counting, Greedy +3· 5 companies

Showing 201–250 of 473