Problems

3,947+ problems · 946 Easy · 2062 Medium · 939 Hard

Active:Easy· 946 results

Title	Solution	Practice	Difficulty	Companies	Topics
414. Third Maximum Number	Solution	Solve	Easy	Amazon+7	Array Sorting
415. Add Strings	Solution	Solve	Easy	Airbnb+14	Math Simulation+1
422. Valid Word Square	Solution	Solve	Easy	Apple+1	Array Matrix
434. Number of Segments in a String	Solution	Solve	Easy	Amazon+2	String
441. Arranging Coins	Solution	Solve	Easy	Amazon+5	Binary Search Math
448. Find All Numbers Disappeared in an Array	Solution	Solve	Easy	Adobe+8	Array Hash Table
455. Assign Cookies	Solution	Solve	Easy	Accenture+8	Array Greedy+2
459. Repeated Substring Pattern	Solution	Solve	Easy	Amazon+7	String String Matching
461. Hamming Distance	Solution	Solve	Easy	Amazon+4	Bit Manipulation
463. Island Perimeter	Solution	Solve	Easy	Amazon+9	Array Breadth-First Search+2
476. Number Complement	Solution	Solve	Easy	Cloudera+4	Bit Manipulation
482. License Key Formatting	Solution	Solve	Easy	Amazon+1	String
485. Max Consecutive Ones	Solution	Solve	Easy	Accenture+12	Array
492. Construct the Rectangle	Solution	Solve	Easy	Amazon+1	Math
495. Teemo Attacking	Solution	Solve	Easy	Amazon+4	Array Simulation
496. Next Greater Element I	Solution	Solve	Easy	Accenture+16	Array Hash Table+2
500. Keyboard Row	Solution	Solve	Easy	Amazon+3	Array Hash Table+1
501. Find Mode in Binary Search Tree	Solution	Solve	Easy	Amazon+3	Binary Search Tree Binary Tree+2
504. Base 7	Solution	Solve	Easy	Amazon+3	Math
506. Relative Ranks	Solution	Solve	Easy	Amazon+3	Array Heap (Priority Queue)+1
507. Perfect Number	Solution	Solve	Easy	Accenture+7	Math
509. Fibonacci Number	Solution	Solve	Easy	Accenture+17	Dynamic Programming Math+2
511. Game Play Analysis I	Solution	Solve	Easy	Amazon+5	Database
512. Game Play Analysis II	Solution	Solve	Easy	Amazon+1	Database
520. Detect Capital	Solution	Solve	Easy	Bloomberg+3	String
521. Longest Uncommon Subsequence I	Solution	Solve	Easy	Google+1	String
530. Minimum Absolute Difference in BST	Solution	Solve	Easy	Amazon+2	Binary Search Tree Binary Tree+3
541. Reverse String II	Solution	Solve	Easy	Accenture+6	String Two Pointers
543. Diameter of Binary Tree	Solution	Solve	Easy	Adobe+18	Binary Tree Depth-First Search+1
551. Student Attendance Record I	Solution	Solve	Easy	Bloomberg+1	String
557. Reverse Words in a String III	Solution	Solve	Easy	Amazon+6	String Two Pointers
559. Maximum Depth of N-ary Tree	Solution	Solve	Easy	Amazon+1	Breadth-First Search Depth-First Search+1
561. Array Partition	Solution	Solve	Easy	Amazon+5	Array Counting Sort+2
563. Binary Tree Tilt	Solution	Solve	Easy	Amazon+2	Binary Tree Depth-First Search+1
566. Reshape the Matrix	Solution	Solve	Easy	Amazon+3	Array Matrix+1
572. Subtree of Another Tree	Solution	Solve	Easy	Amazon+7	Binary Tree Depth-First Search+3
575. Distribute Candies	Solution	Solve	Easy	Bloomberg+3	Array Hash Table
577. Employee Bonus	Solution	Solve	Easy	Amazon+6	Database
584. Find Customer Referee	Solution	Solve	Easy	Adobe+7	Database
586. Customer Placing the Largest Number of Orders	Solution	Solve	Easy	Amazon+3	Database
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
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
603. Consecutive Available Seats	Solution	Solve	Easy	-	Database
604. Design Compressed String Iterator	Solution	Solve	Easy	Google	Array Design+2