Problems

3,848+ problems · 928 Easy · 2014 Medium · 906 Hard

Title	Solution	Practice	Difficulty	Companies	Topics
551. Student Attendance Record I	Solution	Solve	Easy	Bloomberg+1	String
552. Student Attendance Record II	Solution	Solve	Hard	Bloomberg+2	Dynamic Programming
553. Optimal Division	Solution	Solve	Medium	Amazon	Array Dynamic Programming+1
554. Brick Wall	Solution	Solve	Medium	Agoda+7	Array Hash Table
555. Split Concatenated Strings	Solution	Solve	Medium	Alibaba	Array Greedy+1
556. Next Greater Element III	Solution	Solve	Medium	Adobe+13	Math String+1
557. Reverse Words in a String III	Solution	Solve	Easy	Amazon+6	String Two Pointers
558. Logical OR of Two Binary Grids Represented as Quad-Trees	Solution	Solve	Medium	-	Divide and Conquer Tree
559. Maximum Depth of N-ary Tree	Solution	Solve	Easy	Amazon+1	Breadth-First Search Depth-First Search+1
560. Subarray Sum Equals K	Solution	Solve	Medium	Accenture+45	Array Hash Table+1
561. Array Partition	Solution	Solve	Easy	Amazon+5	Array Counting Sort+2
562. Longest Line of Consecutive One in Matrix	Solution	Solve	Medium	Google	Array Dynamic Programming+1
563. Binary Tree Tilt	Solution	Solve	Easy	Amazon+2	Binary Tree Depth-First Search+1
564. Find the Closest Palindrome	Solution	Solve	Hard	Amazon+6	Math String
565. Array Nesting	Solution	Solve	Medium	Amazon+2	Array Depth-First Search
566. Reshape the Matrix	Solution	Solve	Easy	Amazon+3	Array Matrix+1
567. Permutation in String	Solution	Solve	Medium	Accenture+14	Hash Table Sliding Window+2
568. Maximum Vacation Days	Solution	Solve	Hard	Datadog+2	Array Dynamic Programming+1
569. Median Employee Salary	Solution	Solve	Hard	Google	Database
570. Managers with at Least 5 Direct Reports	Solution	Solve	Medium	Amazon+8	Database
571. Find Median Given Frequency of Numbers	Solution	Solve	Hard	Pinterest	Database
572. Subtree of Another Tree	Solution	Solve	Easy	Amazon+7	Binary Tree Depth-First Search+3
573. Squirrel Simulation	Solution	Solve	Medium	Square	Array Math
574. Winning Candidate	Solution	Solve	Medium	-	Database
575. Distribute Candies	Solution	Solve	Easy	Bloomberg+3	Array Hash Table
576. Out of Boundary Paths	Solution	Solve	Medium	Amazon+2	Dynamic Programming
577. Employee Bonus	Solution	Solve	Easy	Amazon+6	Database
578. Get Highest Answer Rate Question	Solution	Solve	Medium	Meta	Database
579. Find Cumulative Salary of an Employee	Solution	Solve	Hard	Amazon	Database
580. Count Student Number in Departments	Solution	Solve	Medium	Twitter	Database
581. Shortest Unsorted Continuous Subarray	Solution	Solve	Medium	Adobe+9	Array Greedy+4
582. Kill Process	Solution	Solve	Medium	Amazon+3	Array Breadth-First Search+3
583. Delete Operation for Two Strings	Solution	Solve	Medium	Amazon+4	Dynamic Programming String
584. Find Customer Referee	Solution	Solve	Easy	Adobe+7	Database
585. Investments in 2016	Solution	Solve	Medium	Amazon+5	Database
586. Customer Placing the Largest Number of Orders	Solution	Solve	Easy	Amazon+3	Database
587. Erect the Fence	Solution	Solve	Hard	Amazon+2	Array Geometry+1
588. Design In-Memory File System	Solution	Solve	Hard	Amazon+14	Design Hash Table+3
589. N-ary Tree Preorder Traversal	Solution	Solve	Easy	Amazon+1	Depth-First Search Stack+1
590. N-ary Tree Postorder Traversal	Solution	Solve	Easy	Amazon+2	Depth-First Search Stack+1
591. Tag Validator	Solution	Solve	Hard	Faire+1	Stack String
592. Fraction Addition and Subtraction	Solution	Solve	Medium	Amazon+5	Math Simulation+1
593. Valid Square	Solution	Solve	Medium	Bloomberg+3	Geometry Math
594. Longest Harmonious Subsequence	Solution	Solve	Easy	Amazon+6	Array Counting+3
595. Big Countries	Solution	Solve	Easy	Amazon+6	Database
596. Classes More Than 5 Students	Solution	Solve	Easy	Google+2	Database
597. Friend Requests I: Overall Acceptance Rate	Solution	Solve	Easy	Meta	Database
598. Range Addition II	Solution	Solve	Easy	Amazon+1	Array Math
599. Minimum Index Sum of Two Lists	Solution	Solve	Easy	Amazon+3	Array Hash Table+1
600. Non-negative Integers without Consecutive Ones	Solution	Solve	Hard	Amazon+4	Dynamic Programming