Leetcode Solutions

Table Of Contents

• Leetcode Solutions
  • Table Of Contents
  • Description
    • If you want to use this project
    • Steps
  • My Leetcode Stats
  • Table of my Solutions

Description

This is a repo to store my leetcode solutions but I went a bit Schizo with it and it pulls the leetcode solutions, creates READMEs with the problema and solution and then converts it into an Mkdocs website hosted on GitHub Pages.

If you want to use this project

If you want to use this project follow the steps here.

Steps

1. Uses the joshcai/leetcode-sync GitHub action to will the problems and solutions from leetcode into the /Solutions folder.
2. Uses the Script update_project_readme.py to compile all of the completed problems into a table in 2 readme files that can be used for GitHub and the Mkdocs site
3. Uses the Script update_readmes.py.py to create README files from the problems and solutions and embed their difficulty, tags and the solution's statistics.
4. Uses Mkdocs to convert the READMEs created in Step 3 to a website.
5. The website is then deployed using the GitHub Pages deploy action.

My Leetcode Stats

Table of my Solutions

Problem	Solution	Difficulty	Tags
1. Two Sum	🔗		Array, Hash Table
2. Add Two Numbers	🔗		Linked List, Math, Recursion
3. Longest Substring Without Repeating Characters	🔗		Hash Table, String, Sliding Window
4. Median Of Two Sorted Arrays	🔗		Array, Binary Search, Divide and Conquer
5. Longest Palindromic Substring	🔗		Two Pointers, String, Dynamic Programming
6. Zigzag Conversion	🔗		String
7. Reverse Integer	🔗		Math
8. String To Integer Atoi	🔗		String
9. Palindrome Number	🔗		Math
10. Regular Expression Matching	🔗		String, Dynamic Programming, Recursion
11. Container With Most Water	🔗		Array, Two Pointers, Greedy
12. Integer To Roman	🔗		Hash Table, Math, String
13. Roman To Integer	🔗		Hash Table, Math, String
14. Longest Common Prefix	🔗		Array, String, Trie
15. 3sum	🔗		Array, Two Pointers, Sorting
16. 3sum Closest	🔗		Array, Two Pointers, Sorting
17. Letter Combinations Of A Phone Number	🔗		Hash Table, String, Backtracking
18. 4sum	🔗		Array, Two Pointers, Sorting
19. Remove Nth Node From End Of List	🔗		Linked List, Two Pointers
20. Valid Parentheses	🔗		String, Stack
21. Merge Two Sorted Lists	🔗		Linked List, Recursion
22. Generate Parentheses	🔗		String, Dynamic Programming, Backtracking
23. Merge K Sorted Lists	🔗		Linked List, Divide and Conquer, Heap (Priority Queue), Merge Sort
24. Swap Nodes In Pairs	🔗		Linked List, Recursion
25. Reverse Nodes In K Group	🔗		Linked List, Recursion
26. Remove Duplicates From Sorted Array	🔗		Array, Two Pointers
27. Remove Element	🔗		Array, Two Pointers
28. Find The Index Of The First Occurrence In A String	🔗		Two Pointers, String, String Matching
29. Divide Two Integers	🔗		Math, Bit Manipulation
30. Substring With Concatenation Of All Words	🔗		Hash Table, String, Sliding Window
31. Next Permutation	🔗		Array, Two Pointers
32. Longest Valid Parentheses	🔗		String, Dynamic Programming, Stack
33. Search In Rotated Sorted Array	🔗		Array, Binary Search
34. Find First And Last Position Of Element In Sorted Array	🔗		Array, Binary Search
35. Search Insert Position	🔗		Array, Binary Search
36. Valid Sudoku	🔗		Array, Hash Table, Matrix
37. Sudoku Solver	🔗		Array, Hash Table, Backtracking, Matrix
38. Count And Say	🔗		String
39. Combination Sum	🔗		Array, Backtracking
40. Combination Sum II	🔗		Array, Backtracking
41. First Missing Positive	🔗		Array, Hash Table
42. Trapping Rain Water	🔗		Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack
43. Multiply Strings	🔗		Math, String, Simulation
44. Wildcard Matching	🔗		String, Dynamic Programming, Greedy, Recursion
45. Jump Game II	🔗		Array, Dynamic Programming, Greedy
46. Permutations	🔗		Array, Backtracking
47. Permutations II	🔗		Array, Backtracking, Sorting
48. Rotate Image	🔗		Array, Math, Matrix
49. Group Anagrams	🔗		Array, Hash Table, String, Sorting
50. Powx N	🔗		Math, Recursion
51. N Queens	🔗		Array, Backtracking
52. N Queens II	🔗		Backtracking
54. Spiral Matrix	🔗		Array, Matrix, Simulation
55. Jump Game	🔗		Array, Dynamic Programming, Greedy
56. Merge Intervals	🔗		Array, Sorting
57. Insert Interval	🔗		Array
58. Length Of Last Word	🔗		String
59. Spiral Matrix II	🔗		Array, Matrix, Simulation
62. Unique Paths	🔗		Math, Dynamic Programming, Combinatorics
63. Unique Paths II	🔗		Array, Dynamic Programming, Matrix
64. Minimum Path Sum	🔗		Array, Dynamic Programming, Matrix
66. Plus One	🔗		Array, Math
67. Add Binary	🔗		Math, String, Bit Manipulation, Simulation
68. Text Justification	🔗		Array, String, Simulation
69. Sqrtx	🔗		Math, Binary Search
70. Climbing Stairs	🔗		Math, Dynamic Programming, Memoization
72. Edit Distance	🔗		String, Dynamic Programming
73. Set Matrix Zeroes	🔗		Array, Hash Table, Matrix
74. Search A 2d Matrix	🔗		Array, Binary Search, Matrix
76. Minimum Window Substring	🔗		Hash Table, String, Sliding Window
78. Subsets	🔗		Array, Backtracking, Bit Manipulation
79. Word Search	🔗		Array, String, Backtracking, Depth-First Search, Matrix
80. Remove Duplicates From Sorted Array II	🔗		Array, Two Pointers
81. Search In Rotated Sorted Array II	🔗		Array, Binary Search
83. Remove Duplicates From Sorted List	🔗		Linked List
84. Largest Rectangle In Histogram	🔗		Array, Stack, Monotonic Stack
88. Merge Sorted Array	🔗		Array, Two Pointers, Sorting
89. Gray Code	🔗		Math, Backtracking, Bit Manipulation
90. Subsets II	🔗		Array, Backtracking, Bit Manipulation
94. Binary Tree Inorder Traversal	🔗		Stack, Tree, Depth-First Search, Binary Tree
96. Unique Binary Search Trees	🔗		Math, Dynamic Programming, Tree, Binary Search Tree, Binary Tree
98. Validate Binary Search Tree	🔗		Tree, Depth-First Search, Binary Search Tree, Binary Tree
99. Recover Binary Search Tree	🔗		Tree, Depth-First Search, Binary Search Tree, Binary Tree
100. Same Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
101. Symmetric Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
104. Maximum Depth Of Binary Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
105. Construct Binary Tree From Preorder And Inorder Traversal	🔗		Array, Hash Table, Divide and Conquer, Tree, Binary Tree
106. Construct Binary Tree From Inorder And Postorder Traversal	🔗		Array, Hash Table, Divide and Conquer, Tree, Binary Tree
108. Convert Sorted Array To Binary Search Tree	🔗		Array, Divide and Conquer, Tree, Binary Search Tree, Binary Tree
110. Balanced Binary Tree	🔗		Tree, Depth-First Search, Binary Tree
111. Minimum Depth Of Binary Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
112. Path Sum	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
113. Path Sum II	🔗		Backtracking, Tree, Depth-First Search, Binary Tree
114. Flatten Binary Tree To Linked List	🔗		Linked List, Stack, Tree, Depth-First Search, Binary Tree
115. Distinct Subsequences	🔗		String, Dynamic Programming
116. Populating Next Right Pointers In Each Node	🔗		Linked List, Tree, Depth-First Search, Breadth-First Search, Binary Tree
117. Populating Next Right Pointers In Each Node II	🔗		Linked List, Tree, Depth-First Search, Breadth-First Search, Binary Tree
118. Pascals Triangle	🔗		Array, Dynamic Programming
119. Pascals Triangle II	🔗		Array, Dynamic Programming
120. Triangle	🔗		Array, Dynamic Programming
121. Best Time To Buy And Sell Stock	🔗		Array, Dynamic Programming
122. Best Time To Buy And Sell Stock II	🔗		Array, Dynamic Programming, Greedy
123. Best Time To Buy And Sell Stock III	🔗		Array, Dynamic Programming
129. Sum Root To Leaf Numbers	🔗		Tree, Depth-First Search, Binary Tree
130. Surrounded Regions	🔗		Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
133. Clone Graph	🔗		Hash Table, Depth-First Search, Breadth-First Search, Graph
134. Gas Station	🔗		Array, Greedy
135. Candy	🔗		Array, Greedy
136. Single Number	🔗		Array, Bit Manipulation
137. Single Number II	🔗		Array, Bit Manipulation
139. Word Break	🔗		Array, Hash Table, String, Dynamic Programming, Trie, Memoization
141. Linked List Cycle	🔗		Hash Table, Linked List, Two Pointers
144. Binary Tree Preorder Traversal	🔗		Stack, Tree, Depth-First Search, Binary Tree
145. Binary Tree Postorder Traversal	🔗		Stack, Tree, Depth-First Search, Binary Tree
146. Lru Cache	🔗		Hash Table, Linked List, Design, Doubly-Linked List
153. Find Minimum In Rotated Sorted Array	🔗		Array, Binary Search
154. Find Minimum In Rotated Sorted Array II	🔗		Array, Binary Search
162. Find Peak Element	🔗		Array, Binary Search
165. Compare Version Numbers	🔗		Two Pointers, String
166. Fraction To Recurring Decimal	🔗		Hash Table, Math, String
167. Two Sum II Input Array Is Sorted	🔗		Array, Two Pointers, Binary Search
169. Majority Element	🔗		Array, Hash Table, Divide and Conquer, Sorting, Counting
175. Combine Two Tables	🔗		Database
176. Second Highest Salary	🔗		Database
177. Nth Highest Salary	🔗		Database
178. Rank Scores	🔗		Database
179. Largest Number	🔗		Array, String, Greedy, Sorting
181. Employees Earning More Than Their Managers	🔗		Database
182. Duplicate Emails	🔗		Database
183. Customers Who Never Order	🔗		Database
184. Department Highest Salary	🔗		Database
185. Department Top Three Salaries	🔗		Database
187. Repeated Dna Sequences	🔗		Hash Table, String, Bit Manipulation, Sliding Window, Rolling Hash, Hash Function
188. Best Time To Buy And Sell Stock IV	🔗		Array, Dynamic Programming
190. Reverse Bits	🔗		Divide and Conquer, Bit Manipulation
191. Number Of 1 Bits	🔗		Divide and Conquer, Bit Manipulation
196. Delete Duplicate Emails	🔗		Database
197. Rising Temperature	🔗		Database
198. House Robber	🔗		Array, Dynamic Programming
199. Binary Tree Right Side View	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
200. Number Of Islands	🔗		Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
201. Bitwise And Of Numbers Range	🔗		Bit Manipulation
203. Remove Linked List Elements	🔗		Linked List, Recursion
206. Reverse Linked List	🔗		Linked List, Recursion
207. Course Schedule	🔗		Depth-First Search, Breadth-First Search, Graph, Topological Sort
209. Minimum Size Subarray Sum	🔗		Array, Binary Search, Sliding Window, Prefix Sum
210. Course Schedule II	🔗		Depth-First Search, Breadth-First Search, Graph, Topological Sort
215. Kth Largest Element In An Array	🔗		Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
217. Contains Duplicate	🔗		Array, Hash Table, Sorting
218. The Skyline Problem	🔗		Array, Divide and Conquer, Binary Indexed Tree, Segment Tree, Line Sweep, Sorting, Heap (Priority Queue), Ordered Set
221. Maximal Square	🔗		Array, Dynamic Programming, Matrix
222. Count Complete Tree Nodes	🔗		Binary Search, Bit Manipulation, Tree, Binary Tree
226. Invert Binary Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
231. Power Of Two	🔗		Math, Bit Manipulation, Recursion
234. Palindrome Linked List	🔗		Linked List, Two Pointers, Stack, Recursion
237. Delete Node In A Linked List	🔗		Linked List
238. Product Of Array Except Self	🔗		Array, Prefix Sum
239. Sliding Window Maximum	🔗		Array, Queue, Sliding Window, Heap (Priority Queue), Monotonic Queue
240. Search A 2d Matrix II	🔗		Array, Binary Search, Divide and Conquer, Matrix
257. Binary Tree Paths	🔗		String, Backtracking, Tree, Depth-First Search, Binary Tree
260. Single Number III	🔗		Array, Bit Manipulation
264. Ugly Number II	🔗		Hash Table, Math, Dynamic Programming, Heap (Priority Queue)
268. Missing Number	🔗		Array, Hash Table, Math, Binary Search, Bit Manipulation, Sorting
275. H Index II	🔗		Array, Binary Search
278. First Bad Version	🔗		Binary Search, Interactive
283. Move Zeroes	🔗		Array, Two Pointers
287. Find The Duplicate Number	🔗		Array, Two Pointers, Binary Search, Bit Manipulation
295. Find Median From Data Stream	🔗		Two Pointers, Design, Sorting, Heap (Priority Queue), Data Stream
300. Longest Increasing Subsequence	🔗		Array, Binary Search, Dynamic Programming
303. Range Sum Query Immutable	🔗		Array, Design, Prefix Sum
309. Best Time To Buy And Sell Stock With Cooldown	🔗		Array, Dynamic Programming
315. Count Of Smaller Numbers After Self	🔗		Array, Binary Search, Divide and Conquer, Binary Indexed Tree, Segment Tree, Merge Sort, Ordered Set
316. Remove Duplicate Letters	🔗		String, Stack, Greedy, Monotonic Stack
321. Create Maximum Number	🔗		Array, Two Pointers, Stack, Greedy, Monotonic Stack
324. Wiggle Sort II	🔗		Array, Divide and Conquer, Greedy, Sorting, Quickselect
326. Power Of Three	🔗		Math, Recursion
327. Count Of Range Sum	🔗		Array, Binary Search, Divide and Conquer, Binary Indexed Tree, Segment Tree, Merge Sort, Ordered Set
330. Patching Array	🔗		Array, Greedy
334. Increasing Triplet Subsequence	🔗		Array, Greedy
338. Counting Bits	🔗		Dynamic Programming, Bit Manipulation
342. Power Of Four	🔗		Math, Bit Manipulation, Recursion
347. Top K Frequent Elements	🔗		Array, Hash Table, Divide and Conquer, Sorting, Heap (Priority Queue), Bucket Sort, Counting, Quickselect
349. Intersection Of Two Arrays	🔗		Array, Hash Table, Two Pointers, Binary Search, Sorting
350. Intersection Of Two Arrays II	🔗		Array, Hash Table, Two Pointers, Binary Search, Sorting
352. Data Stream As Disjoint Intervals	🔗		Binary Search, Design, Ordered Set
354. Russian Doll Envelopes	🔗		Array, Binary Search, Dynamic Programming, Sorting
355. Design Twitter	🔗		Hash Table, Linked List, Design, Heap (Priority Queue)
363. Max Sum Of Rectangle No Larger Than K	🔗		Array, Binary Search, Matrix, Prefix Sum, Ordered Set
367. Valid Perfect Square	🔗		Math, Binary Search
371. Sum Of Two Integers	🔗		Math, Bit Manipulation
373. Find K Pairs With Smallest Sums	🔗		Array, Heap (Priority Queue)
374. Guess Number Higher Or Lower	🔗		Binary Search, Interactive
376. Wiggle Subsequence	🔗		Array, Dynamic Programming, Greedy
378. Kth Smallest Element In A Sorted Matrix	🔗		Array, Binary Search, Sorting, Heap (Priority Queue), Matrix
389. Find The Difference	🔗		Hash Table, String, Bit Manipulation, Sorting
392. Is Subsequence	🔗		Two Pointers, String, Dynamic Programming
397. Integer Replacement	🔗		Dynamic Programming, Greedy, Bit Manipulation, Memoization
400. Nth Digit	🔗		Math, Binary Search
401. Binary Watch	🔗		Backtracking, Bit Manipulation
402. Remove K Digits	🔗		String, Stack, Greedy, Monotonic Stack
404. Sum Of Left Leaves	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
405. Convert A Number To Hexadecimal	🔗		Math, String, Bit Manipulation
407. Trapping Rain Water II	🔗		Array, Breadth-First Search, Heap (Priority Queue), Matrix
409. Longest Palindrome	🔗		Hash Table, String, Greedy
410. Split Array Largest Sum	🔗		Array, Binary Search, Dynamic Programming, Greedy, Prefix Sum
412. Fizz Buzz	🔗		Math, String, Simulation
414. Third Maximum Number	🔗		Array, Sorting
417. Pacific Atlantic Water Flow	🔗		Array, Depth-First Search, Breadth-First Search, Matrix
421. Maximum Xor Of Two Numbers In An Array	🔗		Array, Hash Table, Bit Manipulation, Trie
434. Number Of Segments In A String	🔗		String
436. Find Right Interval	🔗		Array, Binary Search, Sorting
441. Arranging Coins	🔗		Math, Binary Search
442. Find All Duplicates In An Array	🔗		Array, Hash Table
448. Find All Numbers Disappeared In An Array	🔗		Array, Hash Table
451. Sort Characters By Frequency	🔗		Hash Table, String, Sorting, Heap (Priority Queue), Bucket Sort, Counting
455. Assign Cookies	🔗		Array, Two Pointers, Greedy, Sorting
456. 132 Pattern	🔗		Array, Binary Search, Stack, Monotonic Stack, Ordered Set
459. Repeated Substring Pattern	🔗		String, String Matching
461. Hamming Distance	🔗		Bit Manipulation
463. Island Perimeter	🔗		Array, Depth-First Search, Breadth-First Search, Matrix
464. Can I Win	🔗		Math, Dynamic Programming, Bit Manipulation, Memoization, Game Theory, Bitmask
473. Matchsticks To Square	🔗		Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
476. Number Complement	🔗		Bit Manipulation
477. Total Hamming Distance	🔗		Array, Math, Bit Manipulation
482. License Key Formatting	🔗		String
485. Max Consecutive Ones	🔗		Array
491. Non Decreasing Subsequences	🔗		Array, Hash Table, Backtracking, Bit Manipulation
492. Construct The Rectangle	🔗		Math
495. Teemo Attacking	🔗		Array, Simulation
496. Next Greater Element I	🔗		Array, Hash Table, Stack, Monotonic Stack
498. Diagonal Traverse	🔗		Array, Matrix, Simulation
500. Keyboard Row	🔗		Array, Hash Table, String
501. Find Mode In Binary Search Tree	🔗		Tree, Depth-First Search, Binary Search Tree, Binary Tree
502. Ipo	🔗		Array, Greedy, Sorting, Heap (Priority Queue)
504. Base 7	🔗		Math, String
506. Relative Ranks	🔗		Array, Sorting, Heap (Priority Queue)
507. Perfect Number	🔗		Math
516. Longest Palindromic Subsequence	🔗		String, Dynamic Programming
520. Detect Capital	🔗		String
521. Longest Uncommon Subsequence I	🔗		String
530. Minimum Absolute Difference In Bst	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Search Tree, Binary Tree
541. Reverse String II	🔗		Two Pointers, String
543. Diameter Of Binary Tree	🔗		Tree, Depth-First Search, Binary Tree
551. Student Attendance Record I	🔗		String
557. Reverse Words In A String III	🔗		Two Pointers, String
561. Array Partition	🔗		Array, Greedy, Sorting, Counting Sort
563. Binary Tree Tilt	🔗		Tree, Depth-First Search, Binary Tree
566. Reshape The Matrix	🔗		Array, Matrix, Simulation
567. Permutation In String	🔗		Hash Table, Two Pointers, String, Sliding Window
570. Managers With At Least 5 Direct Reports	🔗		Database
572. Subtree Of Another Tree	🔗		Tree, Depth-First Search, String Matching, Binary Tree, Hash Function
575. Distribute Candies	🔗		Array, Hash Table
577. Employee Bonus	🔗		Database
584. Find Customer Referee	🔗		Database
586. Customer Placing The Largest Number Of Orders	🔗		Database
594. Longest Harmonious Subsequence	🔗		Array, Hash Table, Sliding Window, Sorting, Counting
595. Big Countries	🔗		Database
596. Classes With At Least 5 Students	🔗		Database
598. Range Addition II	🔗		Array, Math
599. Minimum Index Sum Of Two Lists	🔗		Array, Hash Table, String
601. Human Traffic Of Stadium	🔗		Database
602. Friend Requests II Who Has The Most Friends	🔗		Database
605. Can Place Flowers	🔗		Array, Greedy
607. Sales Person	🔗		Database
608. Tree Node	🔗		Database
610. Triangle Judgement	🔗		Database
611. Valid Triangle Number	🔗		Array, Two Pointers, Binary Search, Greedy, Sorting
617. Merge Two Binary Trees	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
619. Biggest Single Number	🔗		Database
620. Not Boring Movies	🔗		Database
621. Task Scheduler	🔗		Array, Hash Table, Greedy, Sorting, Heap (Priority Queue), Counting
626. Exchange Seats	🔗		Database
627. Swap Salary	🔗		Database
628. Maximum Product Of Three Numbers	🔗		Array, Math, Sorting
637. Average Of Levels In Binary Tree	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Tree
643. Maximum Average Subarray I	🔗		Array, Sliding Window
645. Set Mismatch	🔗		Array, Hash Table, Bit Manipulation, Sorting
646. Maximum Length Of Pair Chain	🔗		Array, Dynamic Programming, Greedy, Sorting
653. Two Sum IV Input Is A Bst	🔗		Hash Table, Two Pointers, Tree, Depth-First Search, Breadth-First Search, Binary Search Tree, Binary Tree
657. Robot Return To Origin	🔗		String, Simulation
658. Find K Closest Elements	🔗		Array, Two Pointers, Binary Search, Sliding Window, Sorting, Heap (Priority Queue)
659. Split Array Into Consecutive Subsequences	🔗		Array, Hash Table, Greedy, Heap (Priority Queue)
661. Image Smoother	🔗		Array, Matrix
671. Second Minimum Node In A Binary Tree	🔗		Tree, Depth-First Search, Binary Tree
673. Number Of Longest Increasing Subsequence	🔗		Array, Dynamic Programming, Binary Indexed Tree, Segment Tree
674. Longest Continuous Increasing Subsequence	🔗		Array
679. 24 Game	🔗		Array, Math, Backtracking
680. Valid Palindrome II	🔗		Two Pointers, String, Greedy
682. Baseball Game	🔗		Array, Stack, Simulation
692. Top K Frequent Words	🔗		Array, Hash Table, String, Trie, Sorting, Heap (Priority Queue), Bucket Sort, Counting
693. Binary Number With Alternating Bits	🔗		Bit Manipulation
696. Count Binary Substrings	🔗		Two Pointers, String
697. Degree Of An Array	🔗		Array, Hash Table
712. Minimum Ascii Delete Sum For Two Strings	🔗		String, Dynamic Programming
714. Best Time To Buy And Sell Stock With Transaction Fee	🔗		Array, Dynamic Programming, Greedy
717. 1 Bit And 2 Bit Characters	🔗		Array
724. Find Pivot Index	🔗		Array, Prefix Sum
728. Self Dividing Numbers	🔗		Math
733. Flood Fill	🔗		Array, Depth-First Search, Breadth-First Search, Matrix
740. Delete And Earn	🔗		Array, Hash Table, Dynamic Programming
742. To Lower Case	🔗		String
744. Network Delay Time	🔗		Depth-First Search, Breadth-First Search, Graph, Heap (Priority Queue), Shortest Path
745. Find Smallest Letter Greater Than Target	🔗		Array, Binary Search
747. Min Cost Climbing Stairs	🔗		Array, Dynamic Programming
748. Largest Number At Least Twice Of Others	🔗		Array, Sorting
749. Shortest Completing Word	🔗		Array, Hash Table, String
767. Prime Number Of Set Bits In Binary Representation	🔗		Math, Bit Manipulation
774. Maximum Depth Of N Ary Tree	🔗		Tree, Depth-First Search, Breadth-First Search
775. N Ary Tree Preorder Traversal	🔗		Stack, Tree, Depth-First Search
776. N Ary Tree Postorder Traversal	🔗		Stack, Tree, Depth-First Search
777. Toeplitz Matrix	🔗		Array, Matrix
778. Reorganize String	🔗		Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting
782. Jewels And Stones	🔗		Hash Table, String
783. Search In A Binary Search Tree	🔗		Tree, Binary Search Tree, Binary Tree
784. Insert Into A Binary Search Tree	🔗		Tree, Binary Search Tree, Binary Tree
789. Kth Largest Element In A Stream	🔗		Tree, Design, Binary Search Tree, Heap (Priority Queue), Binary Tree, Data Stream
792. Binary Search	🔗		Array, Binary Search
794. Swim In Rising Water	🔗		Array, Binary Search, Depth-First Search, Breadth-First Search, Union Find, Heap (Priority Queue), Matrix
799. Minimum Distance Between Bst Nodes	🔗		Tree, Depth-First Search, Breadth-First Search, Binary Search Tree, Binary Tree
802. K Th Smallest Prime Fraction	🔗		Array, Two Pointers, Binary Search, Sorting, Heap (Priority Queue)
803. Cheapest Flights Within K Stops	🔗		Dynamic Programming, Depth-First Search, Breadth-First Search, Graph, Heap (Priority Queue), Shortest Path
812. Rotate String	🔗		String, String Matching
816. Design Hashset	🔗		Array, Hash Table, Linked List, Design, Hash Function
817. Design Hashmap	🔗		Array, Hash Table, Linked List, Design, Hash Function
822. Unique Morse Code Words	🔗		Array, Hash Table, String
824. Number Of Lines To Write String	🔗		Array, String
826. Soup Servings	🔗		Math, Dynamic Programming, Probability and Statistics
829. Subdomain Visit Count	🔗		Array, Hash Table, String, Counting
830. Largest Triangle Area	🔗		Array, Math, Geometry
837. Most Common Word	🔗		Array, Hash Table, String, Counting
867. New 21 Game	🔗		Math, Dynamic Programming, Sliding Window, Probability and Statistics
874. Backspace String Compare	🔗		Two Pointers, String, Stack, Simulation
879. Maximize Distance To Closest Person	🔗		Array
882. Peak Index In A Mountain Array	🔗		Array, Binary Search
900. Reordered Power Of 2	🔗		Hash Table, Math, Sorting, Counting, Enumeration
908. Middle Of The Linked List	🔗		Linked List, Two Pointers
940. Fruit Into Baskets	🔗		Array, Hash Table, Sliding Window
967. Minimum Falling Path Sum	🔗		Array, Dynamic Programming, Matrix
1006. Vowel Spellchecker	🔗		Array, Hash Table, String
1013. Fibonacci Number	🔗		Math, Dynamic Programming, Recursion, Memoization
1018. Largest Perimeter Triangle	🔗		Array, Math, Greedy, Sorting
1019. Squares Of A Sorted Array	🔗		Array, Two Pointers, Sorting
1054. Complement Of Base 10 Integer	🔗		Bit Manipulation
1087. Longest Arithmetic Subsequence	🔗		Array, Hash Table, Binary Search, Dynamic Programming
1105. Uncrossed Lines	🔗		Array, Dynamic Programming
1111. Minimum Score Triangulation Of Polygon	🔗		Array, Dynamic Programming
1135. Customers Who Bought All Products	🔗		Database
1153. Product Sales Analysis I	🔗		Database
1179. Game Play Analysis I	🔗		Database
1182. Game Play Analysis IV	🔗		Database
1236. N Th Tribonacci Number	🔗		Math, Dynamic Programming, Memoization
1245. User Activity For The Past 30 Days I	🔗		Database
1250. Longest Common Subsequence	🔗		String, Dynamic Programming
1258. Article Views I	🔗		Database
1264. Maximum Number Of Words You Can Type	🔗		Hash Table, String
1330. Longest Arithmetic Subsequence Of Given Difference	🔗		Array, Hash Table, Dynamic Programming
1353. Find Resultant Array After Removing Anagrams	🔗		Array, Hash Table, String, Sorting
1364. Tuple With Same Product	🔗		Array, Hash Table, Counting
1370. Count Number Of Nice Subarrays	🔗		Array, Hash Table, Math, Sliding Window, Prefix Sum
1390. Average Selling Price	🔗		Database
1402. Count Square Submatrices With All Ones	🔗		Array, Dynamic Programming, Matrix
1407. Group The People Given The Group Size They Belong To	🔗		Array, Hash Table, Greedy
1411. Convert Binary Number In A Linked List To Integer	🔗		Linked List, Math
1415. Students And Examinations	🔗		Database
1421. Find Numbers With Even Number Of Digits	🔗		Array, Math
1423. Maximum Number Of Occurrences Of A Substring	🔗		Hash Table, String, Sliding Window
1426. Find N Unique Integers Sum Up To Zero	🔗		Array, Math
1437. Minimum Insertion Steps To Make A String Palindrome	🔗		String, Dynamic Programming
1440. Convert Integer To The Sum Of Two No Zero Integers	🔗		Math
1448. Maximum 69 Number	🔗		Math, Greedy
1509. Replace Employee Id With The Unique Identifier	🔗		Database
1582. Design Browser History	🔗		Array, Linked List, Stack, Design, Doubly-Linked List, Data Stream
1586. Longest Subarray Of 1s After Deleting One Element	🔗		Array, Dynamic Programming, Sliding Window
1612. Avoid Flood In The City	🔗		Array, Hash Table, Binary Search, Greedy, Heap (Priority Queue)
1619. Path Crossing	🔗		Hash Table, String
1628. Count Submatrices With All Ones	🔗		Array, Dynamic Programming, Stack, Matrix, Monotonic Stack
1642. Water Bottles	🔗		Math, Simulation
1675. Magnetic Force Between Two Balls	🔗		Array, Binary Search, Sorting
1765. Merge In Between Linked Lists	🔗		Linked List
1827. Invalid Tweets	🔗		Database
1834. Minimum Number Of People To Teach	🔗		Array, Hash Table, Greedy
1908. Recyclable And Low Fat Products	🔗		Database
1917. Maximum Average Pass Ratio	🔗		Array, Greedy, Heap (Priority Queue)
1923. Sentence Similarity III	🔗		Array, Two Pointers, String
2006. Find The Student That Will Replace The Chalk	🔗		Array, Binary Search, Simulation, Prefix Sum
2023. Design Movie Rental System	🔗		Array, Hash Table, Design, Heap (Priority Queue), Ordered Set
2076. Sum Of Digits Of String After Convert	🔗		String, Simulation
2096. Find The Longest Valid Obstacle Course At Each Position	🔗		Array, Binary Search, Binary Indexed Tree
2102. Find The Middle Index In Array	🔗		Array, Prefix Sum
2132. Convert 1d Array Into 2d Array	🔗		Array, Matrix, Simulation
2174. Next Greater Numerically Balanced Number	🔗		Hash Table, Math, Backtracking, Counting, Enumeration
2229. Maximum Fruits Harvested After At Most K Steps	🔗		Array, Binary Search, Sliding Window, Prefix Sum
2307. Replace Non Coprime Numbers In Array	🔗		Array, Math, Stack, Number Theory
2316. Count Hills And Valleys In An Array	🔗		Array
2324. Find Triangular Sum Of An Array	🔗		Array, Math, Simulation, Combinatorics
2346. Largest 3 Same Digit Number In String	🔗		String
2392. Successful Pairs Of Spells And Potions	🔗		Array, Two Pointers, Binary Search, Sorting
2408. Number Of People Aware Of A Secret	🔗		Dynamic Programming, Queue, Simulation
2429. Design A Food Rating System	🔗		Array, Hash Table, String, Design, Heap (Priority Queue), Ordered Set
2432. Number Of Zero Filled Subarrays	🔗		Array, Math
2497. Maximum Matching Of Players With Trainers	🔗		Array, Two Pointers, Greedy, Sorting
2529. Range Product Queries Of Powers	🔗		Array, Bit Manipulation, Prefix Sum
2661. Smallest Missing Non Negative Integer After Operations	🔗		Array, Hash Table, Math, Greedy
2689. Rearranging Fruits	🔗		Array, Hash Table, Greedy, Sort
2734. Array Prototype Last	🔗
2758. Check If Object Instance Of Class	🔗
2837. Minimum Operations To Make The Integer Zero	🔗		Bit Manipulation, Brainteaser, Enumeration
2882. Ways To Express An Integer As Sum Of Powers	🔗		Dynamic Programming
2887. Sort Vowels In A String	🔗		String, Sorting
3242. Count Elements With Maximum Frequency	🔗		Array, Hash Table, Counting
3251. Maximum Area Of Longest Diagonal Rectangle	🔗		Array
3277. Find The Number Of Ways To Place People II	🔗		Array, Math, Geometry, Sorting, Enumeration
3278. Find The Number Of Ways To Place People I	🔗		Array, Math, Geometry, Sorting, Enumeration
3279. Alice And Bob Playing Flower Game	🔗		Math
3336. Water Bottles II	🔗		Math, Simulation
3383. Taking Maximum Energy From The Mystic Dungeon	🔗		Array, Prefix Sum
3437. Maximum Total Damage With Spell Casting	🔗		Array, Hash Table, Two Pointers, Binary Search, Dynamic Programming, Sorting, Counting
3459. Find The Minimum Area To Cover All Ones II	🔗		Array, Matrix, Enumeration
3461. Find The Minimum Area To Cover All Ones I	🔗		Array, Matrix
3462. Vowels Game In A String	🔗		Math, String, Brainteaser, Game Theory
3612. Adjacent Increasing Subarrays Detection I	🔗		Array
3619. Adjacent Increasing Subarrays Detection II	🔗		Array, Binary Search
3648. Find The Maximum Number Of Fruits Collected	🔗		Array, Dynamic Programming, Matrix
3678. Design Task Manager	🔗		Hash Table, Design, Heap (Priority Queue), Ordered Set
3733. Length Of Longest V Shaped Diagonal Segment	🔗		Array, Dynamic Programming, Memoization, Matrix
3744. Minimum Operations To Make Array Elements Zero	🔗		Array, Math, Bit Manipulation
3748. Sort Matrix By Diagonals	🔗		Array, Sorting, Matrix
3790. Fruits Into Baskets II	🔗		Array, Binary Search, Segment Tree, Simulation, Ordered Set
3791. Fruits Into Baskets III	🔗		Array, Binary Search, Segment Tree, Ordered Set
3794. Find The Minimum Amount Of Time To Brew Potions	🔗		Array, Simulation, Prefix Sum
3797. Design Spreadsheet	🔗		Array, Hash Table, String, Design, Matrix
3827. Implement Router	🔗		Array, Hash Table, Binary Search, Design, Queue, Ordered Set
3830. Find Closest Person	🔗		Math
3851. Find Sum Of Array Product Of Magical Sequences	🔗		Array, Math, Dynamic Programming, Bit Manipulation, Combinatorics, Bitmask
3872. Find Most Frequent Vowel And Consonant	🔗		Hash Table, String, Counting