list-06

Question	Free?	Status	Difficulty	Topics	Similar Questions
501. Find Mode in Binary Search Tree  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Binary Search Tree  🔗 Binary Tree  🔗	98. Validate Binary Search Tree  🔗  📝
502. IPO  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Greedy  🔗 Sorting  🔗 Heap (Priority Queue)  🔗
503. Next Greater Element II  🔗  📝	🆓		⭐️⭐️	Array  🔗 Stack  🔗 Monotonic Stack  🔗	496. Next Greater Element I  🔗  📝 556. Next Greater Element III  🔗  📝
504. Base 7  🔗  📝	🆓		⭐️	Math  🔗
505. The Maze II  🔗  📝	💰		⭐️⭐️	Depth-First Search  🔗 Breadth-First Search  🔗 Graph  🔗 Heap (Priority Queue)  🔗 Shortest Path  🔗	490. The Maze  🔗  📝 499. The Maze III  🔗  📝
506. Relative Ranks  🔗  📝	🆓		⭐️	Array  🔗 Sorting  🔗 Heap (Priority Queue)  🔗
507. Perfect Number  🔗  📝	🆓		⭐️	Math  🔗	728. Self Dividing Numbers  🔗  📝
508. Most Frequent Subtree Sum  🔗  📝	🆓	✅	⭐️⭐️	Hash Table  🔗 Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	572. Subtree of Another Tree  🔗  📝 1973. Count Nodes Equal to Sum of Descendants  🔗  📝
509. Fibonacci Number  🔗  📝	🆓		⭐️	Math  🔗 Dynamic Programming  🔗 Recursion  🔗 Memoization  🔗	70. Climbing Stairs  🔗  📝 842. Split Array into Fibonacci Sequence  🔗  📝 873. Length of Longest Fibonacci Subsequence  🔗  📝 1137. N-th Tribonacci Number  🔗  📝
510. Inorder Successor in BST II  🔗  📝	💰		⭐️⭐️	Tree  🔗 Binary Search Tree  🔗 Binary Tree  🔗	285. Inorder Successor in BST  🔗  📝
511. Game Play Analysis I  🔗  📝	🆓		⭐️	Database  🔗	512. Game Play Analysis II  🔗  📝
512. Game Play Analysis II  🔗  📝	💰		⭐️	Database  🔗	511. Game Play Analysis I  🔗  📝 534. Game Play Analysis III  🔗  📝
513. Find Bottom Left Tree Value  🔗  📝	🆓	✅	⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Binary Tree  🔗
514. Freedom Trail  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Dynamic Programming  🔗 Depth-First Search  🔗 Breadth-First Search  🔗
515. Find Largest Value in Each Tree Row  🔗  📝	🆓	✅	⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Binary Tree  🔗
516. Longest Palindromic Subsequence  🔗  📝	🆓		⭐️⭐️	String  🔗 Dynamic Programming  🔗	5. Longest Palindromic Substring  🔗  📝 647. Palindromic Substrings  🔗  📝 730. Count Different Palindromic Subsequences  🔗  📝 1143. Longest Common Subsequence  🔗  📝 1682. Longest Palindromic Subsequence II  🔗  📝 1771. Maximize Palindrome Length From Subsequences  🔗  📝 2002. Maximum Product of the Length of Two Palindromic Subsequences  🔗  📝
517. Super Washing Machines  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Greedy  🔗
518. Coin Change 2  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗	2218. Maximum Value of K Coins From Piles  🔗  📝
519. Random Flip Matrix  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 Math  🔗 Reservoir Sampling  🔗 Randomized  🔗
520. Detect Capital  🔗  📝	🆓	✅	⭐️	String  🔗	2129. Capitalize the Title  🔗  📝
521. Longest Uncommon Subsequence I  🔗  📝	🆓		⭐️	String  🔗	522. Longest Uncommon Subsequence II  🔗  📝
522. Longest Uncommon Subsequence II  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Two Pointers  🔗 String  🔗 Sorting  🔗	521. Longest Uncommon Subsequence I  🔗  📝
523. Continuous Subarray Sum  🔗  📝	🆓		⭐️⭐️	Array  🔗 Hash Table  🔗 Math  🔗 Prefix Sum  🔗	560. Subarray Sum Equals K  🔗  📝 2009. Minimum Number of Operations to Make Array Continuous  🔗  📝 2121. Intervals Between Identical Elements  🔗  📝
524. Longest Word in Dictionary through Deleting  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 String  🔗 Sorting  🔗	720. Longest Word in Dictionary  🔗  📝
525. Contiguous Array  🔗  📝	🆓	👀	⭐️⭐️	Array  🔗 Hash Table  🔗 Prefix Sum  🔗	325. Maximum Size Subarray Sum Equals k  🔗  📝
526. Beautiful Arrangement  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Backtracking  🔗 Bit Manipulation  🔗 Bitmask  🔗	667. Beautiful Arrangement II  🔗  📝
527. Word Abbreviation  🔗  📝	💰		⭐️⭐️⭐️	Array  🔗 String  🔗 Greedy  🔗 Trie  🔗 Sorting  🔗	408. Valid Word Abbreviation  🔗  📝 411. Minimum Unique Word Abbreviation  🔗  📝
528. Random Pick with Weight  🔗  📝	🆓		⭐️⭐️	Math  🔗 Binary Search  🔗 Prefix Sum  🔗 Randomized  🔗	398. Random Pick Index  🔗  📝 497. Random Point in Non-overlapping Rectangles  🔗  📝 710. Random Pick with Blacklist  🔗  📝
529. Minesweeper  🔗  📝	🆓		⭐️⭐️	Array  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Matrix  🔗	2101. Detonate the Maximum Bombs  🔗  📝
530. Minimum Absolute Difference in BST  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗 Binary Search Tree  🔗 Binary Tree  🔗	532. K-diff Pairs in an Array  🔗  📝
531. Lonely Pixel I  🔗  📝	💰		⭐️⭐️	Array  🔗 Hash Table  🔗 Matrix  🔗	533. Lonely Pixel II  🔗  📝
532. K-diff Pairs in an Array  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Hash Table  🔗 Two Pointers  🔗 Binary Search  🔗 Sorting  🔗	530. Minimum Absolute Difference in BST  🔗  📝 2006. Count Number of Pairs With Absolute Difference K  🔗  📝 2040. Kth Smallest Product of Two Sorted Arrays  🔗  📝 2364. Count Number of Bad Pairs  🔗  📝
533. Lonely Pixel II  🔗  📝	💰		⭐️⭐️	Array  🔗 Hash Table  🔗 Matrix  🔗	531. Lonely Pixel I  🔗  📝
534. Game Play Analysis III  🔗  📝	💰		⭐️⭐️	Database  🔗	512. Game Play Analysis II  🔗  📝 550. Game Play Analysis IV  🔗  📝
535. Encode and Decode TinyURL  🔗  📝	🆓		⭐️⭐️	Hash Table  🔗 String  🔗 Design  🔗 Hash Function  🔗
536. Construct Binary Tree from String  🔗  📝	💰		⭐️⭐️	String  🔗 Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	606. Construct String from Binary Tree  🔗  📝
537. Complex Number Multiplication  🔗  📝	🆓		⭐️⭐️	Math  🔗 String  🔗 Simulation  🔗
538. Convert BST to Greater Tree  🔗  📝	🆓	✅	⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Binary Search Tree  🔗 Binary Tree  🔗
539. Minimum Time Difference  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 String  🔗 Sorting  🔗	2162. Minimum Cost to Set Cooking Time  🔗  📝
540. Single Element in a Sorted Array  🔗  📝	🆓		⭐️⭐️	Array  🔗 Binary Search  🔗
541. Reverse String II  🔗  📝	🆓	✅	⭐️	Two Pointers  🔗 String  🔗	344. Reverse String  🔗  📝 557. Reverse Words in a String III  🔗  📝
542. 01 Matrix  🔗  📝	🆓		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Breadth-First Search  🔗 Matrix  🔗	1730. Shortest Path to Get Food  🔗  📝 2123. Minimum Operations to Remove Adjacent Ones in Matrix  🔗  📝
543. Diameter of Binary Tree  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	1522. Diameter of N-Ary Tree  🔗  📝 2246. Longest Path With Different Adjacent Characters  🔗  📝
544. Output Contest Matches  🔗  📝	💰		⭐️⭐️	String  🔗 Recursion  🔗 Simulation  🔗
545. Boundary of Binary Tree  🔗  📝	💰		⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	199. Binary Tree Right Side View  🔗  📝
546. Remove Boxes  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Memoization  🔗	664. Strange Printer  🔗  📝 2107. Number of Unique Flavors After Sharing K Candies  🔗  📝
547. Number of Provinces  🔗  📝	🆓	✅	⭐️⭐️	Depth-First Search  🔗 Breadth-First Search  🔗 Union Find  🔗 Graph  🔗	323. Number of Connected Components in an Undirected Graph  🔗  📝 657. Robot Return to Origin  🔗  📝 734. Sentence Similarity  🔗  📝 737. Sentence Similarity II  🔗  📝 1101. The Earliest Moment When Everyone Become Friends  🔗  📝 2101. Detonate the Maximum Bombs  🔗  📝
548. Split Array with Equal Sum  🔗  📝	💰		⭐️⭐️⭐️	Array  🔗 Prefix Sum  🔗	1573. Number of Ways to Split a String  🔗  📝 2305. Fair Distribution of Cookies  🔗  📝
549. Binary Tree Longest Consecutive Sequence II  🔗  📝	💰		⭐️⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	298. Binary Tree Longest Consecutive Sequence  🔗  📝 2229. Check if an Array Is Consecutive  🔗  📝
550. Game Play Analysis IV  🔗  📝	💰		⭐️⭐️	Database  🔗	534. Game Play Analysis III  🔗  📝 1097. Game Play Analysis V  🔗  📝
551. Student Attendance Record I  🔗  📝	🆓	✅	⭐️	String  🔗	552. Student Attendance Record II  🔗  📝
552. Student Attendance Record II  🔗  📝	🆓		⭐️⭐️⭐️	Dynamic Programming  🔗	551. Student Attendance Record I  🔗  📝
553. Optimal Division  🔗  📝	🆓		⭐️⭐️	Array  🔗 Math  🔗 Dynamic Programming  🔗
554. Brick Wall  🔗  📝	🆓	👀	⭐️⭐️	Array  🔗 Hash Table  🔗	2184. Number of Ways to Build Sturdy Brick Wall  🔗  📝
555. Split Concatenated Strings  🔗  📝	💰		⭐️⭐️	Array  🔗 String  🔗 Greedy  🔗
556. Next Greater Element III  🔗  📝	🆓		⭐️⭐️	Math  🔗 Two Pointers  🔗 String  🔗	496. Next Greater Element I  🔗  📝 503. Next Greater Element II  🔗  📝 1842. Next Palindrome Using Same Digits  🔗  📝
557. Reverse Words in a String III  🔗  📝	🆓	✅	⭐️	Two Pointers  🔗 String  🔗	541. Reverse String II  🔗  📝
558. Logical OR of Two Binary Grids Represented as Quad-Trees  🔗  📝	🆓		⭐️⭐️	Divide and Conquer  🔗 Tree  🔗
559. Maximum Depth of N-ary Tree  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗	104. Maximum Depth of Binary Tree  🔗  📝 2039. The Time When the Network Becomes Idle  🔗  📝
560. Subarray Sum Equals K  🔗  📝	🆓	✅	⭐️⭐️	Array  🔗 Hash Table  🔗 Prefix Sum  🔗	1. Two Sum  🔗  📝 523. Continuous Subarray Sum  🔗  📝 713. Subarray Product Less Than K  🔗  📝 724. Find Pivot Index  🔗  📝 974. Subarray Sums Divisible by K  🔗  📝 1658. Minimum Operations to Reduce X to Zero  🔗  📝 2090. K Radius Subarray Averages  🔗  📝 2219. Maximum Sum Score of Array  🔗  📝
561. Array Partition  🔗  📝	🆓	✅	⭐️	Array  🔗 Greedy  🔗 Sorting  🔗 Counting Sort  🔗	1984. Minimum Difference Between Highest and Lowest of K Scores  🔗  📝 2144. Minimum Cost of Buying Candies With Discount  🔗  📝 2155. All Divisions With the Highest Score of a Binary Array  🔗  📝
562. Longest Line of Consecutive One in Matrix  🔗  📝	💰		⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Matrix  🔗
563. Binary Tree Tilt  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 Binary Tree  🔗	1469. Find All The Lonely Nodes  🔗  📝
564. Find the Closest Palindrome  🔗  📝	🆓		⭐️⭐️⭐️	Math  🔗 String  🔗	1842. Next Palindrome Using Same Digits  🔗  📝 2217. Find Palindrome With Fixed Length  🔗  📝
565. Array Nesting  🔗  📝	🆓		⭐️⭐️	Array  🔗 Depth-First Search  🔗	339. Nested List Weight Sum  🔗  📝 341. Flatten Nested List Iterator  🔗  📝 364. Nested List Weight Sum II  🔗  📝
566. Reshape the Matrix  🔗  📝	🆓	✅	⭐️	Array  🔗 Matrix  🔗 Simulation  🔗	2022. Convert 1D Array Into 2D Array  🔗  📝
567. Permutation in String  🔗  📝	🆓	✅	⭐️⭐️	Hash Table  🔗 Two Pointers  🔗 String  🔗 Sliding Window  🔗	76. Minimum Window Substring  🔗  📝 438. Find All Anagrams in a String  🔗  📝
568. Maximum Vacation Days  🔗  📝	💰		⭐️⭐️⭐️	Array  🔗 Dynamic Programming  🔗 Matrix  🔗	787. Cheapest Flights Within K Stops  🔗  📝
569. Median Employee Salary  🔗  📝	💰		⭐️⭐️⭐️	Database  🔗	571. Find Median Given Frequency of Numbers  🔗  📝
570. Managers with at Least 5 Direct Reports  🔗  📝	💰		⭐️⭐️	Database  🔗
571. Find Median Given Frequency of Numbers  🔗  📝	💰		⭐️⭐️⭐️	Database  🔗	569. Median Employee Salary  🔗  📝
572. Subtree of Another Tree  🔗  📝	🆓	✅	⭐️	Tree  🔗 Depth-First Search  🔗 String Matching  🔗 Binary Tree  🔗 Hash Function  🔗	250. Count Univalue Subtrees  🔗  📝 508. Most Frequent Subtree Sum  🔗  📝
573. Squirrel Simulation  🔗  📝	💰		⭐️⭐️	Array  🔗 Math  🔗
574. Winning Candidate  🔗  📝	💰		⭐️⭐️	Database  🔗
575. Distribute Candies  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗
576. Out of Boundary Paths  🔗  📝	🆓		⭐️⭐️	Dynamic Programming  🔗	688. Knight Probability in Chessboard  🔗  📝 2120. Execution of All Suffix Instructions Staying in a Grid  🔗  📝
577. Employee Bonus  🔗  📝	💰		⭐️	Database  🔗	175. Combine Two Tables  🔗  📝
578. Get Highest Answer Rate Question  🔗  📝	💰		⭐️⭐️	Database  🔗
579. Find Cumulative Salary of an Employee  🔗  📝	💰		⭐️⭐️⭐️	Database  🔗
580. Count Student Number in Departments  🔗  📝	💰		⭐️⭐️	Database  🔗
581. Shortest Unsorted Continuous Subarray  🔗  📝	🆓		⭐️⭐️	Array  🔗 Two Pointers  🔗 Stack  🔗 Greedy  🔗 Sorting  🔗 Monotonic Stack  🔗
582. Kill Process  🔗  📝	💰		⭐️⭐️	Array  🔗 Hash Table  🔗 Tree  🔗 Depth-First Search  🔗 Breadth-First Search  🔗
583. Delete Operation for Two Strings  🔗  📝	🆓		⭐️⭐️	String  🔗 Dynamic Programming  🔗	72. Edit Distance  🔗  📝 712. Minimum ASCII Delete Sum for Two Strings  🔗  📝 1143. Longest Common Subsequence  🔗  📝
584. Find Customer Referee  🔗  📝	🆓		⭐️	Database  🔗
585. Investments in 2016  🔗  📝	💰		⭐️⭐️	Database  🔗
586. Customer Placing the Largest Number of Orders  🔗  📝	🆓		⭐️	Database  🔗
587. Erect the Fence  🔗  📝	🆓		⭐️⭐️⭐️	Array  🔗 Math  🔗 Geometry  🔗	1924. Erect the Fence II  🔗  📝
588. Design In-Memory File System  🔗  📝	💰		⭐️⭐️⭐️	Hash Table  🔗 String  🔗 Design  🔗 Trie  🔗	146. LRU Cache  🔗  📝 460. LFU Cache  🔗  📝 635. Design Log Storage System  🔗  📝
589. N-ary Tree Preorder Traversal  🔗  📝	🆓	✅	⭐️	Stack  🔗 Tree  🔗 Depth-First Search  🔗	144. Binary Tree Preorder Traversal  🔗  📝 429. N-ary Tree Level Order Traversal  🔗  📝 590. N-ary Tree Postorder Traversal  🔗  📝
590. N-ary Tree Postorder Traversal  🔗  📝	🆓	✅	⭐️	Stack  🔗 Tree  🔗 Depth-First Search  🔗	145. Binary Tree Postorder Traversal  🔗  📝 429. N-ary Tree Level Order Traversal  🔗  📝 589. N-ary Tree Preorder Traversal  🔗  📝
591. Tag Validator  🔗  📝	🆓		⭐️⭐️⭐️	String  🔗 Stack  🔗	616. Add Bold Tag in String  🔗  📝
592. Fraction Addition and Subtraction  🔗  📝	🆓	✅	⭐️⭐️	Math  🔗 String  🔗 Simulation  🔗	640. Solve the Equation  🔗  📝
593. Valid Square  🔗  📝	🆓		⭐️⭐️	Math  🔗 Geometry  🔗
594. Longest Harmonious Subsequence  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗 Sorting  🔗
595. Big Countries  🔗  📝	🆓		⭐️	Database  🔗
596. Classes More Than 5 Students  🔗  📝	🆓		⭐️	Database  🔗
597. Friend Requests I: Overall Acceptance Rate  🔗  📝	💰		⭐️	Database  🔗
598. Range Addition II  🔗  📝	🆓		⭐️	Array  🔗 Math  🔗	370. Range Addition  🔗  📝
599. Minimum Index Sum of Two Lists  🔗  📝	🆓	✅	⭐️	Array  🔗 Hash Table  🔗 String  🔗	160. Intersection of Two Linked Lists  🔗  📝
600. Non-negative Integers without Consecutive Ones  🔗  📝	🆓	👀	⭐️⭐️⭐️	Dynamic Programming  🔗	198. House Robber  🔗  📝 213. House Robber II  🔗  📝 474. Ones and Zeroes  🔗  📝