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Strivers A2Z DSAOfficial

This sheet is made for people who want to learn DSA from A to Z for free in a well-organized and structured manner.

By FleetCode249 problems52 Easy154 Medium43 Hard37 followersUpdated 28 May 2025

Start: Reverse Integer

249problems

52Easy

154Medium

43Hard

Signed in, the sheet shows which of these you have solved.

Showing 52 of 249 problems · Easy · Clear

TitleSolutionAcceptDifficultyTopics

9. Palindrome NumberVideo

Solution61.0%Easy

Math· 31 companies

1134. Armstrong NumberVideoPremium

Solution77.8%Easy

Math· 1 company

1752. Check if Array Is Sorted and RotatedVideo

Solution57.3%Easy

Array· 10 companies

26. Remove Duplicates from Sorted ArrayVideo

Solution63.7%Easy

Array, Two Pointers· 26 companies

283. Move ZeroesVideo

Solution64.3%Easy

Array, Two Pointers· 46 companies

136. Single NumberVideo

Solution78.1%Easy

Array, Bit Manipulation· 15 companies

485. Max Consecutive OnesVideo

Solution66.0%Easy

Array· 14 companies

268. Missing NumberVideo

Solution72.4%Easy

Array, Binary Search +4· 19 companies

125. Valid PalindromeVideo

Solution54.2%Easy

String, Two Pointers· 39 companies

509. Fibonacci NumberVideo

Solution74.6%Easy

Dynamic Programming, Math +2· 16 companies

1. Two SumVideo

Solution57.8%Easy

Array, Hash Table· 127 companies

169. Majority ElementVideo

Solution66.2%Easy

Array, Counting +3· 22 companies

121. Best Time to Buy and Sell StockVideo

Solution57.1%Easy

Array, Dynamic Programming· 92 companies

118. Pascal's TriangleVideo

Solution79.4%Easy

Array, Dynamic Programming· 17 companies

88. Merge Sorted ArrayVideo

Solution55.7%Easy

Array, Sorting +1· 37 companies

704. Binary SearchVideo

Solution61.2%Easy

Array, Binary Search· 11 companies

35. Search Insert PositionVideo

Solution52.1%Easy

Array, Binary Search· 12 companies

1539. Kth Missing Positive NumberVideo

Solution63.9%Easy

Array, Binary Search· 9 companies

1021. Remove Outermost ParenthesesVideo

Solution88.3%Easy

Stack, String· 6 companies

1903. Largest Odd Number in StringVideo

Solution67.7%Easy

Greedy, Math +1· 6 companies

14. Longest Common PrefixVideo

Solution48.6%Easy

String, Trie· 60 companies

205. Isomorphic StringsVideo

Solution48.8%Easy

Hash Table, String· 15 companies

796. Rotate StringVideo

Solution66.6%Easy

String, String Matching· 12 companies

242. Valid AnagramVideo

Solution68.5%Easy

Hash Table, Sorting +1· 40 companies

1614. Maximum Nesting Depth of the ParenthesesVideo

Solution86.1%Easy

Stack, String· 7 companies

13. Roman to IntegerVideo

Solution67.0%Easy

Hash Table, Math +1· 36 companies

876. Middle of the Linked ListVideo

Solution82.3%Easy

Linked List, Two Pointers· 13 companies

206. Reverse Linked ListVideo

Solution81.0%Easy

Linked List, Recursion· 34 companies

141. Linked List CycleVideo

Solution55.2%Easy

Hash Table, Linked List +1· 24 companies

234. Palindrome Linked ListVideo

Solution58.8%Easy

Linked List, Recursion +2· 17 companies

160. Intersection of Two Linked ListsVideo

Solution64.6%Easy

Hash Table, Linked List +1· 13 companies

2220. Minimum Bit Flips to Convert NumberVideo

Solution88.0%Easy

Bit Manipulation· 7 companies

225. Implement Stack using QueuesVideo

Solution70.1%Easy

Design, Queue +1· 9 companies

232. Implement Queue using StacksVideo

Solution70.2%Easy

Design, Queue +1· 12 companies

20. Valid ParenthesesVideo

Solution45.2%Easy

Stack, String· 113 companies

496. Next Greater Element IVideo

Solution76.5%Easy

Array, Hash Table +2· 17 companies

703. Kth Largest Element in a StreamVideo

Solution61.4%Easy

Binary Search Tree, Binary Tree +4· 11 companies

455. Assign CookiesVideo

Solution55.4%Easy

Array, Greedy +2· 9 companies

860. Lemonade ChangeVideo

Solution59.6%Easy

Array, Greedy· 8 companies

144. Binary Tree Preorder TraversalVideo

Solution76.6%Easy

Binary Tree, Depth-First Search +2· 5 companies

94. Binary Tree Inorder TraversalVideo

Solution80.4%Easy

Binary Tree, Depth-First Search +2· 7 companies

145. Binary Tree Postorder TraversalVideo

Solution79.0%Easy

Binary Tree, Depth-First Search +2· 5 companies

104. Maximum Depth of Binary TreeVideo

Solution78.6%Easy

Binary Tree, Breadth-First Search +2· 17 companies

110. Balanced Binary TreeVideo

Solution59.2%Easy

Binary Tree, Depth-First Search +1· 9 companies

543. Diameter of Binary TreeVideo

Solution66.4%Easy

Binary Tree, Depth-First Search +1· 20 companies

100. Same TreeVideo

Solution68.0%Easy

Binary Tree, Breadth-First Search +2· 9 companies

101. Symmetric TreeVideo

Solution62.1%Easy

Binary Tree, Breadth-First Search +2· 11 companies

700. Search in a Binary Search TreeVideo

Solution83.1%Easy

Binary Search Tree, Binary Tree +1· 5 companies

653. Two Sum IV - Input is a BSTVideo

Solution63.7%Easy

Binary Search Tree, Binary Tree +5· 8 companies

733. Flood FillVideo

Solution68.6%Easy

Array, Breadth-First Search +2· 12 companies

28. Find the Index of the First Occurrence in a StringVideo

Solution47.0%Easy

String, String Matching +1· 16 companies

70. Climbing StairsVideo

Solution54.0%Easy

Dynamic Programming, Math +1· 37 companies

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