Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
501. Find Mode in Binary Search Tree	Solve	Easy	Adobe+1	Binary Search Tree Binary Tree+2
502. IPO	Solve	Hard	Uber	Array Greedy+2
503. Next Greater Element II	Solve	Medium	Adobe+9	Array Monotonic Stack+1
504. Base 7	Solve	Easy	Google	Math
505. The Maze II	Solve	Medium	Bytedance+2	Array Breadth-First Search+5
506. Relative Ranks	Solve	Easy	Accenture+1	Array Heap (Priority Queue)+1
507. Perfect Number	Solve	Easy	Adobe	Math
508. Most Frequent Subtree Sum	Solve	Medium	Apple	Binary Tree Depth-First Search+2
509. Fibonacci Number	Solve	Easy	Adobe+8	Dynamic Programming Math+2
510. Inorder Successor in BST II	Solve	Medium	Arista Networks+1	Binary Search Tree Binary Tree+1
511. Game Play Analysis I	Solve	Easy	Adobe+4	Database
512. Game Play Analysis II	Solve	Easy	GSN Games	Database
513. Find Bottom Left Tree Value	Solve	Medium	Amazon+2	Binary Tree Breadth-First Search+2
514. Freedom Trail	Solve	Hard	DE Shaw+1	Breadth-First Search Depth-First Search+2
515. Find Largest Value in Each Tree Row	Solve	Medium	Amazon+5	Binary Tree Breadth-First Search+2
516. Longest Palindromic Subsequence	Solve	Medium	Amazon+5	Dynamic Programming String
517. Super Washing Machines	Solve	Hard	Microsoft	Array Greedy
518. Coin Change II	Solve	Medium	Accenture+68	Array Dynamic Programming
519. Random Flip Matrix	Solve	Medium	Google	Hash Table Math+2
520. Detect Capital	Solve	Easy	Amazon+1	String
521. Longest Uncommon Subsequence I	Solve	Easy	Google	String
522. Longest Uncommon Subsequence II	Solve	Medium	Apple	Array Hash Table+3
523. Continuous Subarray Sum	Solve	Medium	Amazon+6	Array Hash Table+2
524. Longest Word in Dictionary through Deleting	Solve	Medium	Google	Array Sorting+2
525. Contiguous Array	Solve	Medium	Amazon+3	Array Hash Table+1
526. Beautiful Arrangement	Solve	Medium	Cisco	Array Backtracking+3
527. Word Abbreviation	Solve	Hard	Google+1	Array Greedy+3
528. Random Pick with Weight	Solve	Medium	Amazon+7	Array Binary Search+3
529. Minesweeper	Solve	Medium	Amazon+6	Array Breadth-First Search+2
530. Minimum Absolute Difference in BST	Solve	Easy	Bloomberg+3	Binary Search Tree Binary Tree+3
531. Lonely Pixel I	Solve	Medium	Google+2	Array Hash Table+1
532. K-diff Pairs in an Array	Solve	Medium	Adobe+7	Array Binary Search+3
533. Lonely Pixel II	Solve	Medium	Google	Array Hash Table+1
534. Game Play Analysis III	Solve	Medium	GSN Games	Database
535. Encode and Decode TinyURL	Solve	Medium	Amazon+2	Design Hash Function+2
536. Construct Binary Tree from String	Solve	Medium	Facebook	Binary Tree Depth-First Search+3
537. Complex Number Multiplication	Solve	Medium	Amazon	Math Simulation+1
538. Convert BST to Greater Tree	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+2
539. Minimum Time Difference	Solve	Medium	Amazon+1	Array Math+2
540. Single Element in a Sorted Array	Solve	Medium	Amazon+5	Array Binary Search
541. Reverse String II	Solve	Easy	Adobe	String Two Pointers
542. 01 Matrix	Solve	Medium	Adobe+16	Array Breadth-First Search+2
543. Diameter of Binary Tree	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+1
544. Output Contest Matches	Solve	Medium	Google	Recursion Simulation+1
545. Boundary of Binary Tree	Solve	Medium	Amazon+3	Binary Tree Depth-First Search+1
546. Remove Boxes	Solve	Hard	Uber	Array Dynamic Programming+1
547. Number of Provinces	Solve	Medium	Amazon+6	Breadth-First Search Depth-First Search+2
548. Split Array with Equal Sum	Solve	Hard	Facebook	Array Hash Table+1
549. Binary Tree Longest Consecutive Sequence II	Solve	Medium	Google	Binary Tree Depth-First Search+1
550. Game Play Analysis IV	Solve	Medium	Adobe+1	Database