Leetcode Study Plan Index

Table of Contents (click to hide)

• Programming Skills
  • Programming Skills I
  • Programming Skills II
  • Programming Skills III ⭐
• Data Structure
  • Data Structure I
  • Data Structure II
  • Data Structure III ⭐
• Algorithm
  • Algorithm I
  • Algorithm II
  • Algorithm III ⭐
• Graph Theory
  • Graph Theory I
  • Graph Theory II ⭐
• Dynamic Programming
  • Dynamic Programming I
  • Dynamic Programming II ⭐
  • Dynamic Programming III ⭐
  • Dynamic Programming IV ⭐
• Binary Search
  • Binary Search I
  • Binary Search II
  • Binary Search III ⭐
• LeetCode 75
  • Level 1
  • Level 2
  • Level 3 ⭐
• SQL
  • SQL I
  • SQL II ⭐
  • SQL III ⭐

stars ⭐ denote premium-only plans (or premium-only problems: only Graph Theory and Dynamic Programming marked so far)

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Programming Skills

Programming Skills I

📊 Tracking list for Programming Skills I

List contains 34 problems (click to expand)

• 1523. Count Odd Numbers in an Interval Range
• 1491. Average Salary Excluding the Minimum and Maximum Salary
• 191. Number of 1 Bits
• 1281. Subtract the Product and Sum of Digits of an Integer
• 976. Largest Perimeter Triangle
• 1779. Find Nearest Point That Has the Same X or Y Coordinate
• 1822. Sign of the Product of an Array
• 1502. Can Make Arithmetic Progression From Sequence
• 202. Happy Number
• 1790. Check if One String Swap Can Make Strings Equal
• 589. N-ary Tree Preorder Traversal
• 496. Next Greater Element I
• 1232. Check If It Is a Straight Line
• 1588. Sum of All Odd Length Subarrays
• 283. Move Zeroes
• 1672. Richest Customer Wealth
• 1572. Matrix Diagonal Sum
• 566. Reshape the Matrix
• 1768. Merge Strings Alternately
• 1678. Goal Parser Interpretation
• 389. Find the Difference
• 709. To Lower Case
• 1309. Decrypt String from Alphabet to Integer Mapping
• 953. Verifying an Alien Dictionary
• 1290. Convert Binary Number in a Linked List to Integer
• 876. Middle of the Linked List
• 104. Maximum Depth of Binary Tree
• 404. Sum of Left Leaves
• 1356. Sort Integers by The Number of 1 Bits
• 232. Implement Queue using Stacks
• 242. Valid Anagram
• 217. Contains Duplicate
• 1603. Design Parking System
• 303. Range Sum Query - Immutable

Programming Skills II

📊 Tracking list for Programming Skills II

List contains 41 problems (click to expand)

• 896. Monotonic Array
• 28. Implement strStr()
• 110. Balanced Binary Tree
• 459. Repeated Substring Pattern
• 150. Evaluate Reverse Polish Notation
• 66. Plus One
• 1367. Linked List in Binary Tree
• 43. Multiply Strings
• 67. Add Binary
• 989. Add to Array-Form of Integer
• 739. Daily Temperatures
• 58. Length of Last Word
• 48. Rotate Image
• 1886. Determine Whether Matrix Can Be Obtained By Rotation
• 54. Spiral Matrix
• 973. K Closest Points to Origin
• 1630. Arithmetic Subarrays
• 429. N-ary Tree Level Order Traversal
• 503. Next Greater Element II
• 556. Next Greater Element III
• 1376. Time Needed to Inform All Employees
• 49. Group Anagrams
• 438. Find All Anagrams in a String
• 713. Subarray Product Less Than K
• 304. Range Sum Query 2D - Immutable
• 910. Smallest Range II
• 143. Reorder List
• 138. Copy List with Random Pointer
• 2. Add Two Numbers
• 445. Add Two Numbers II
• 61. Rotate List
• 173. Binary Search Tree Iterator
• 1845. Seat Reservation Manager
• 860. Lemonade Change
• 155. Min Stack
• 341. Flatten Nested List Iterator
• 1797. Design Authentication Manager
• 707. Design Linked List
• 380. Insert Delete GetRandom O(1)
• 622. Design Circular Queue
• 729. My Calendar I

Programming Skills III ⭐

List contains 54 problems (click to expand)

• 1634. Add Two Polynomials Represented as Linked Lists
• 369. Plus One Linked List
• 1836. Remove Duplicates From an Unsorted Linked List
• 426. Convert Binary Search Tree to Sorted Doubly Linked List
• 325. Maximum Size Subarray Sum Equals k
• 209. Minimum Size Subarray Sum
• 525. Contiguous Array
• 1798. Maximum Number of Consecutive Values You Can Make
• 255. Verify Preorder Sequence in Binary Search Tree
• 224. Basic Calculator
• 901. Online Stock Span
• 241. Different Ways to Add Parentheses
• 449. Serialize and Deserialize BST
• 8. String to Integer (atoi)
• 148. Sort List
• 23. Merge k Sorted Lists
• 708. Insert into a Sorted Circular Linked List
• 282. Expression Add Operators
• 227. Basic Calculator II
• 772. Basic Calculator III
• 641. Design Circular Deque
• 1352. Product of the Last K Numbers
• 1597. Build Binary Expression Tree From Infix Expression
• 214. Shortest Palindrome
• 65. Valid Number
• 208. Implement Trie (Prefix Tree)
• 1804. Implement Trie II (Prefix Tree)
• 642. Design Search Autocomplete System
• 295. Find Median from Data Stream
• 895. Maximum Frequency Stack
• 146. LRU Cache
• 211. Design Add and Search Words Data Structure
• 297. Serialize and Deserialize Binary Tree
• 281. Zigzag Iterator
• 348. Design Tic-Tac-Toe
• 1166. Design File System
• 1586. Binary Search Tree Iterator II
• 1570. Dot Product of Two Sparse Vectors
• 1244. Design A Leaderboard
• 1628. Design an Expression Tree With Evaluate Function
• 460. LFU Cache
• 244. Shortest Word Distance II
• 353. Design Snake Game
• 251. Flatten 2D Vector
• 1622. Fancy Sequence
• 855. Exam Room
• 635. Design Log Storage System
• 631. Design Excel Sum Formula
• 307. Range Sum Query - Mutable
• 535. Encode and Decode TinyURL
• 431. Encode N-ary Tree to Binary Tree
• 381. Insert Delete GetRandom O(1) - Duplicates allowed
• 1396. Design Underground System
• 715. Range Module

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Data Structure

Data Structure I

📊 Tracking list for Data Structure I

List contains 33 problems (click to expand)

• 217. Contains Duplicate
• 53. Maximum Subarray
• 1. Two Sum
• 88. Merge Sorted Array
• 350. Intersection of Two Arrays II
• 121. Best Time to Buy and Sell Stock
• 566. Reshape the Matrix
• 118. Pascal's Triangle
• 36. Valid Sudoku
• 74. Search a 2D Matrix
• 387. First Unique Character in a String
• 383. Ransom Note
• 242. Valid Anagram
• 141. Linked List Cycle
• 21. Merge Two Sorted Lists
• 203. Remove Linked List Elements
• 206. Reverse Linked List
• 83. Remove Duplicates from Sorted List
• 20. Valid Parentheses
• 232. Implement Queue using Stacks
• 144. Binary Tree Preorder Traversal
• 94. Binary Tree Inorder Traversal
• 145. Binary Tree Postorder Traversal
• 102. Binary Tree Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 101. Symmetric Tree
• 226. Invert Binary Tree
• 112. Path Sum
• 700. Search in a Binary Search Tree
• 701. Insert into a Binary Search Tree
• 98. Validate Binary Search Tree
• 653. Two Sum IV - Input is a BST
• 235. Lowest Common Ancestor of a Binary Search Tree

Data Structure II

📊 Tracking list for Data Structure II

List contains 50 problems (click to expand)

• 136. Single Number
• 169. Majority Element
• 15. 3Sum
• 75. Sort Colors
• 56. Merge Intervals
• 706. Design HashMap
• 119. Pascal's Triangle II
• 48. Rotate Image
• 59. Spiral Matrix II
• 240. Search a 2D Matrix II
• 435. Non-overlapping Intervals
• 334. Increasing Triplet Subsequence
• 238. Product of Array Except Self
• 560. Subarray Sum Equals K
• 415. Add Strings
• 409. Longest Palindrome
• 290. Word Pattern
• 763. Partition Labels
• 49. Group Anagrams
• 43. Multiply Strings
• 187. Repeated DNA Sequences
• 5. Longest Palindromic Substring
• 2. Add Two Numbers
• 142. Linked List Cycle II
• 160. Intersection of Two Linked Lists
• 82. Remove Duplicates from Sorted List II
• 24. Swap Nodes in Pairs
• 707. Design Linked List
• 25. Reverse Nodes in k-Group
• 143. Reorder List
• 155. Min Stack
• 1249. Minimum Remove to Make Valid Parentheses
• 1823. Find the Winner of the Circular Game
• 108. Convert Sorted Array to Binary Search Tree
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 199. Binary Tree Right Side View
• 113. Path Sum II
• 450. Delete Node in a BST
• 230. Kth Smallest Element in a BST
• 173. Binary Search Tree Iterator
• 236. Lowest Common Ancestor of a Binary Tree
• 297. Serialize and Deserialize Binary Tree
• 997. Find the Town Judge
• 1557. Minimum Number of Vertices to Reach All Nodes
• 841. Keys and Rooms
• 215. Kth Largest Element in an Array
• 347. Top K Frequent Elements
• 451. Sort Characters By Frequency
• 973. K Closest Points to Origin

Data Structure III ⭐

List contains 60 problems (click to expand)

• 325. Maximum Size Subarray Sum Equals k
• 1151. Minimum Swaps to Group All 1's Together
• 1588. Sum of All Odd Length Subarrays
• 452. Minimum Number of Arrows to Burst Balloons
• 128. Longest Consecutive Sequence
• 454. 4Sum II
• 448. Find All Numbers Disappeared in an Array
• 1427. Perform String Shifts
• 409. Longest Palindrome
• 187. Repeated DNA Sequences
• 5. Longest Palindromic Substring
• 44. Wildcard Matching
• 214. Shortest Palindrome
• 1634. Add Two Polynomials Represented as Linked Lists
• 369. Plus One Linked List
• 148. Sort List
• 138. Copy List with Random Pointer
• 430. Flatten a Multilevel Doubly Linked List
• 281. Zigzag Iterator
• 394. Decode String
• 739. Daily Temperatures
• 42. Trapping Rain Water
• 402. Remove K Digits
• 456. 132 Pattern
• 84. Largest Rectangle in Histogram
• 862. Shortest Subarray with Sum at Least K
• 1602. Find Nearest Right Node in Binary Tree
• 1469. Find All The Lonely Nodes
• 1522. Diameter of N-Ary Tree
• 337. House Robber III
• 1325. Delete Leaves With a Given Value
• 366. Find Leaves of Binary Tree
• 124. Binary Tree Maximum Path Sum
• 968. Binary Tree Cameras
• 886. Possible Bipartition
• 787. Cheapest Flights Within K Stops
• 261. Graph Valid Tree
• 547. Number of Provinces
• 990. Satisfiability of Equality Equations
• 1319. Number of Operations to Make Network Connected
• 305. Number of Islands II
• 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
• 323. Number of Connected Components in an Undirected Graph
• 1101. The Earliest Moment When Everyone Become Friends
• 253. Meeting Rooms II
• 23. Merge k Sorted Lists
• 378. Kth Smallest Element in a Sorted Matrix
• 295. Find Median from Data Stream
• 358. Rearrange String k Distance Apart
• 759. Employee Free Time
• 218. The Skyline Problem
• 1756. Design Most Recently Used Queue
• 729. My Calendar I
• 1606. Find Servers That Handled Most Number of Requests
• 208. Implement Trie (Prefix Tree)
• 211. Design Add and Search Words Data Structure
• 1858. Longest Word With All Prefixes
• 212. Word Search II
• 336. Palindrome Pairs
• 642. Design Search Autocomplete System

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Algorithm

Algorithm I

📊 Tracking list for Algorithm I

List contains 31 problems (click to expand)

• 704. Binary Search
• 278. First Bad Version
• 35. Search Insert Position
• 977. Squares of a Sorted Array
• 189. Rotate Array
• 283. Move Zeroes
• 167. Two Sum II - Input Array Is Sorted
• 344. Reverse String
• 557. Reverse Words in a String III
• 876. Middle of the Linked List
• 19. Remove Nth Node From End of List
• 3. Longest Substring Without Repeating Characters
• 567. Permutation in String
• 733. Flood Fill
• 695. Max Area of Island
• 617. Merge Two Binary Trees
• 116. Populating Next Right Pointers in Each Node
• 542. 01 Matrix
• 994. Rotting Oranges
• 21. Merge Two Sorted Lists
• 206. Reverse Linked List
• 77. Combinations
• 46. Permutations
• 784. Letter Case Permutation
• 70. Climbing Stairs
• 198. House Robber
• 120. Triangle
• 231. Power of Two
• 191. Number of 1 Bits
• 190. Reverse Bits
• 136. Single Number

Algorithm II

📊 Tracking list for Algorithm II

List contains 47 problems (click to expand)

• 34. Find First and Last Position of Element in Sorted Array
• 33. Search in Rotated Sorted Array
• 74. Search a 2D Matrix
• 153. Find Minimum in Rotated Sorted Array
• 162. Find Peak Element
• 82. Remove Duplicates from Sorted List II
• 15. 3Sum
• 844. Backspace String Compare
• 986. Interval List Intersections
• 11. Container With Most Water
• 438. Find All Anagrams in a String
• 713. Subarray Product Less Than K
• 209. Minimum Size Subarray Sum
• 200. Number of Islands
• 547. Number of Provinces
• 117. Populating Next Right Pointers in Each Node II
• 572. Subtree of Another Tree
• 1091. Shortest Path in Binary Matrix
• 130. Surrounded Regions
• 797. All Paths From Source to Target
• 78. Subsets
• 90. Subsets II
• 47. Permutations II
• 39. Combination Sum
• 40. Combination Sum II
• 17. Letter Combinations of a Phone Number
• 22. Generate Parentheses
• 79. Word Search
• 213. House Robber II
• 55. Jump Game
• 45. Jump Game II
• 62. Unique Paths
• 5. Longest Palindromic Substring
• 413. Arithmetic Slices
• 91. Decode Ways
• 139. Word Break
• 300. Longest Increasing Subsequence
• 673. Number of Longest Increasing Subsequence
• 1143. Longest Common Subsequence
• 583. Delete Operation for Two Strings
• 72. Edit Distance
• 322. Coin Change
• 343. Integer Break
• 201. Bitwise AND of Numbers Range
• 384. Shuffle an Array
• 202. Happy Number
• 149. Max Points on a Line

Algorithm III ⭐

List contains 60 problems (click to expand)

• 1060. Missing Element in Sorted Array
• 1901. Find a Peak Element II
• 1231. Divide Chocolate
• 1182. Shortest Distance to Target Color
• 1229. Meeting Scheduler
• 287. Find the Duplicate Number
• 42. Trapping Rain Water
• 1868. Product of Two Run-Length Encoded Arrays
• 159. Longest Substring with At Most Two Distinct Characters
• 340. Longest Substring with At Most K Distinct Characters
• 1004. Max Consecutive Ones III
• 239. Sliding Window Maximum
• 76. Minimum Window Substring
• 286. Walls and Gates
• 417. Pacific Atlantic Water Flow
• 1469. Find All The Lonely Nodes
• 582. Kill Process
• 863. All Nodes Distance K in Binary Tree
• 752. Open the Lock
• 1319. Number of Operations to Make Network Connected
• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 1192. Critical Connections in a Network
• 254. Factor Combinations
• 394. Decode String
• 51. N-Queens
• 37. Sudoku Solver
• 10. Regular Expression Matching
• 241. Different Ways to Add Parentheses
• 301. Remove Invalid Parentheses
• 489. Robot Room Cleaner
• 53. Maximum Subarray
• 4. Median of Two Sorted Arrays
• 315. Count of Smaller Numbers After Self
• 309. Best Time to Buy and Sell Stock with Cooldown
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 410. Split Array Largest Sum
• 337. House Robber III
• 221. Maximal Square
• 85. Maximal Rectangle
• 486. Predict the Winner
• 131. Palindrome Partitioning
• 132. Palindrome Partitioning II
• 416. Partition Equal Subset Sum
• 983. Minimum Cost For Tickets
• 123. Best Time to Buy and Sell Stock III
• 174. Dungeon Game
• 207. Course Schedule
• 210. Course Schedule II
• 310. Minimum Height Trees
• 329. Longest Increasing Path in a Matrix
• 1136. Parallel Courses
• 269. Alien Dictionary
• 260. Single Number III
• 864. Shortest Path to Get All Keys
• 995. Minimum Number of K Consecutive Bit Flips
• 1396. Design Underground System
• 146. LRU Cache
• 981. Time Based Key-Value Store
• 715. Range Module
• 460. LFU Cache

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Graph Theory

Graph Theory I

📊 Tracking list for Graph Theory I

List contains 32 problems (click to expand)

• 733. Flood Fill
• 200. Number of Islands
• 695. Max Area of Island
• 1254. Number of Closed Islands
• 1020. Number of Enclaves
• 1905. Count Sub Islands
• 1162. As Far from Land as Possible
• 417. Pacific Atlantic Water Flow
• 1091. Shortest Path in Binary Matrix
• 542. 01 Matrix
• 934. Shortest Bridge
• 1926. Nearest Exit from Entrance in Maze
• 797. All Paths From Source to Target
• 841. Keys and Rooms
• 547. Number of Provinces
• 1319. Number of Operations to Make Network Connected
• 1376. Time Needed to Inform All Employees
• 802. Find Eventual Safe States
• 1129. Shortest Path with Alternating Colors
• 1466. Reorder Routes to Make All Paths Lead to the City Zero
• 847. Shortest Path Visiting All Nodes
• 1306. Jump Game III
• 1654. Minimum Jumps to Reach Home
• 365. Water and Jug Problem
• 433. Minimum Genetic Mutation
• 752. Open the Lock
• 127. Word Ladder
• 997. Find the Town Judge
• 1557. Minimum Number of Vertices to Reach All Nodes
• 1615. Maximal Network Rank
• 886. Possible Bipartition
• 785. Is Graph Bipartite?

Graph Theory II ⭐

List contains 53 problems (click to expand)

• 261. Graph Valid Tree ⭐
• 684. Redundant Connection
• 685. Redundant Connection II
• 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
• 1101. The Earliest Moment When Everyone Become Friends ⭐
• 990. Satisfiability of Equality Equations
• 1061. Lexicographically Smallest Equivalent String ⭐
• 737. Sentence Similarity II ⭐
• 1258. Synonymous Sentences ⭐
• 1202. Smallest String With Swaps
• 721. Accounts Merge
• 839. Similar String Groups
• 305. Number of Islands II ⭐
• 924. Minimize Malware Spread
• 928. Minimize Malware Spread II
• 1627. Graph Connectivity With Threshold
• 1697. Checking Existence of Edge Length Limited Paths
• 352. Data Stream as Disjoint Intervals
• 207. Course Schedule
• 210. Course Schedule II
• 310. Minimum Height Trees
• 1136. Parallel Courses ⭐
• 269. Alien Dictionary ⭐
• 1857. Largest Color Value in a Directed Graph
• 1591. Strange Printer II
• 1203. Sort Items by Groups Respecting Dependencies
• 1135. Connecting Cities With Minimum Cost ⭐
• 1584. Min Cost to Connect All Points
• 1168. Optimize Water Distribution in a Village ⭐
• 778. Swim in Rising Water
• 1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
• 787. Cheapest Flights Within K Stops
• 1631. Path With Minimum Effort
• 1514. Path with Maximum Probability
• 1928. Minimum Cost to Reach Destination in Time
• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 743. Network Delay Time
• 505. The Maze II ⭐
• 499. The Maze III ⭐
• 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
• 1462. Course Schedule IV
• 1786. Number of Restricted Paths From First to Last Node
• 323. Number of Connected Components in an Undirected Graph ⭐
• 490. The Maze ⭐
• 317. Shortest Distance from All Buildings ⭐
• 1263. Minimum Moves to Move a Box to Their Target Location
• 1345. Jump Game IV
• 864. Shortest Path to Get All Keys
• 913. Cat and Mouse
• 694. Number of Distinct Islands ⭐
• 834. Sum of Distances in Tree
• 1494. Parallel Courses II
• 1192. Critical Connections in a Network

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Dynamic Programming

Dynamic Programming I

📊 Tracking list for Dynamic Programming I

List contains 46 problems (click to expand)

• 509. Fibonacci Number
• 1137. N-th Tribonacci Number
• 70. Climbing Stairs
• 746. Min Cost Climbing Stairs
• 198. House Robber
• 213. House Robber II
• 740. Delete and Earn
• 55. Jump Game
• 45. Jump Game II
• 53. Maximum Subarray
• 918. Maximum Sum Circular Subarray
• 152. Maximum Product Subarray
• 1567. Maximum Length of Subarray With Positive Product
• 1014. Best Sightseeing Pair
• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 309. Best Time to Buy and Sell Stock with Cooldown
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 139. Word Break
• 42. Trapping Rain Water
• 413. Arithmetic Slices
• 91. Decode Ways
• 264. Ugly Number II
• 96. Unique Binary Search Trees
• 118. Pascal's Triangle
• 119. Pascal's Triangle II
• 931. Minimum Falling Path Sum
• 120. Triangle
• 1314. Matrix Block Sum
• 304. Range Sum Query 2D - Immutable
• 62. Unique Paths
• 63. Unique Paths II
• 64. Minimum Path Sum
• 221. Maximal Square
• 5. Longest Palindromic Substring
• 516. Longest Palindromic Subsequence
• 300. Longest Increasing Subsequence
• 376. Wiggle Subsequence
• 392. Is Subsequence
• 1143. Longest Common Subsequence
• 72. Edit Distance
• 322. Coin Change
• 518. Coin Change 2
• 377. Combination Sum IV
• 343. Integer Break
• 279. Perfect Squares

Dynamic Programming II ⭐

List contains 49 problems (click to expand)

• 509. Fibonacci Number
• 70. Climbing Stairs
• 746. Min Cost Climbing Stairs
• 53. Maximum Subarray
• 198. House Robber
• 213. House Robber II
• 256. Paint House
• 265. Paint House II
• 121. Best Time to Buy and Sell Stock
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 309. Best Time to Buy and Sell Stock with Cooldown
• 152. Maximum Product Subarray
• 487. Max Consecutive Ones II ⭐
• 376. Wiggle Subsequence
• 1746. Maximum Subarray Sum After One Operation ⭐
• 1230. Toss Strange Coins
• 1143. Longest Common Subsequence
• 1035. Uncrossed Lines
• 712. Minimum ASCII Delete Sum for Two Strings
• 300. Longest Increasing Subsequence
• 673. Number of Longest Increasing Subsequence
• 1048. Longest String Chain
• 646. Maximum Length of Pair Chain
• 368. Largest Divisible Subset
• 647. Palindromic Substrings
• 5. Longest Palindromic Substring
• 1055. Shortest Way to Form String ⭐
• 516. Longest Palindromic Subsequence
• 64. Minimum Path Sum
• 562. Longest Line of Consecutive One in Matrix ⭐
• 1182. Shortest Distance to Target Color ⭐
• 343. Integer Break
• 238. Product of Array Except Self
• 139. Word Break
• 254. Factor Combinations ⭐
• 329. Longest Increasing Path in a Matrix
• 62. Unique Paths
• 63. Unique Paths II
• 576. Out of Boundary Paths
• 650. 2 Keys Keyboard
• 361. Bomb Enemy ⭐
• 96. Unique Binary Search Trees
• 1130. Minimum Cost Tree From Leaf Values
• 322. Coin Change
• 518. Coin Change 2
• 39. Combination Sum
• 279. Perfect Squares
• 416. Partition Equal Subset Sum
• 494. Target Sum

Dynamic Programming III ⭐

List contains 50 problems (click to expand)

• 1884. Egg Drop With 2 Eggs and N Floors
• 887. Super Egg Drop
• 123. Best Time to Buy and Sell Stock III
• 188. Best Time to Buy and Sell Stock IV
• 1751. Maximum Number of Events That Can Be Attended II
• 1235. Maximum Profit in Job Scheduling
• 1259. Handshakes That Don't Cross ⭐
• 1478. Allocate Mailboxes
• 115. Distinct Subsequences
• 435. Non-overlapping Intervals
• 452. Minimum Number of Arrows to Burst Balloons
• 72. Edit Distance
• 1682. Longest Palindromic Subsequence II ⭐
• 1062. Longest Repeating Substring ⭐
• 1092. Shortest Common Supersequence
• 10. Regular Expression Matching
• 1216. Valid Palindrome III ⭐
• 727. Minimum Window Subsequence ⭐
• 741. Cherry Pickup
• 1463. Cherry Pickup II
• 140. Word Break II
• 351. Android Unlock Patterns ⭐
• 688. Knight Probability in Chessboard
• 750. Number Of Corner Rectangles ⭐
• 651. 4 Keys Keyboard ⭐
• 634. Find the Derangement of An Array ⭐
• 1692. Count Ways to Distribute Candies ⭐
• 418. Sentence Screen Fitting ⭐
• 312. Burst Balloons
• 1246. Palindrome Removal ⭐
• 40. Combination Sum II
• 983. Minimum Cost For Tickets
• 1049. Last Stone Weight II
• 879. Profitable Schemes
• 486. Predict the Winner
• 1406. Stone Game III
• 1510. Stone Game IV
• 464. Can I Win
• 1140. Stone Game II
• 698. Partition to K Equal Sum Subsets
• 1066. Campus Bikes II ⭐
• 1434. Number of Ways to Wear Different Hats to Each Other
• 902. Numbers At Most N Given Digit Set
• 600. Non-negative Integers without Consecutive Ones
• 1067. Digit Count in Range ⭐
• 298. Binary Tree Longest Consecutive Sequence ⭐
• 549. Binary Tree Longest Consecutive Sequence II ⭐
• 333. Largest BST Subtree ⭐
• 1273. Delete Tree Nodes ⭐
• 568. Maximum Vacation Days ⭐

Dynamic Programming IV ⭐

List contains 60 problems (click to expand)

• 123. Best Time to Buy and Sell Stock III
• 188. Best Time to Buy and Sell Stock IV
• 1751. Maximum Number of Events That Can Be Attended II
• 1235. Maximum Profit in Job Scheduling
• 1259. Handshakes That Don't Cross ⭐
• 1478. Allocate Mailboxes
• 32. Longest Valid Parentheses
• 1105. Filling Bookcase Shelves
• 1277. Count Square Submatrices with All Ones
• 361. Bomb Enemy ⭐
• 1155. Number of Dice Rolls With Target Sum
• 1269. Number of Ways to Stay in the Same Place After Some Steps
• 1575. Count All Possible Routes
• 1639. Number of Ways to Form a Target String Given a Dictionary
• 940. Distinct Subsequences II
• 1866. Number of Ways to Rearrange Sticks With K Sticks Visible
• 1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
• 688. Knight Probability in Chessboard
• 837. New 21 Game
• 1547. Minimum Cost to Cut a Stick
• 1312. Minimum Insertion Steps to Make a String Palindrome
• 1278. Palindrome Partitioning III
• 1000. Minimum Cost to Merge Stones
• 664. Strange Printer
• 546. Remove Boxes
• 294. Flip Game II ⭐
• 1406. Stone Game III
• 1510. Stone Game IV
• 1140. Stone Game II
• 526. Beautiful Arrangement
• 1879. Minimum XOR Sum of Two Arrays
• 980. Unique Paths III
• 847. Shortest Path Visiting All Nodes
• 1125. Smallest Sufficient Team
• 691. Stickers to Spell Word
• 1655. Distribute Repeating Integers
• 1349. Maximum Students Taking Exam
• 1434. Number of Ways to Wear Different Hats to Each Other
• 1799. Maximize Score After N Operations
• 1815. Maximum Number of Groups Getting Fresh Donuts
• 1012. Numbers With Repeated Digits
• 1067. Digit Count in Range ⭐
• 865. Smallest Subtree with all the Deepest Nodes
• 1372. Longest ZigZag Path in a Binary Tree
• 894. All Possible Full Binary Trees
• 337. House Robber III
• 124. Binary Tree Maximum Path Sum
• 1130. Minimum Cost Tree From Leaf Values
• 968. Binary Tree Cameras
• 1483. Kth Ancestor of a Tree Node
• 1425. Constrained Subsequence Sum
• 446. Arithmetic Slices II - Subsequence
• 975. Odd Even Jump
• 1687. Delivering Boxes from Storage to Ports
• 1055. Shortest Way to Form String ⭐
• 174. Dungeon Game
• 514. Freedom Trail
• 1473. Paint House III
• 471. Encode String with Shortest Length ⭐
• 1240. Tiling a Rectangle with the Fewest Squares

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Binary Search

Binary Search I

📊 Tracking list for Binary Search I

List contains 23 problems (click to expand)

• 704. Binary Search
• 374. Guess Number Higher or Lower
• 35. Search Insert Position
• 852. Peak Index in a Mountain Array
• 367. Valid Perfect Square
• 1385. Find the Distance Value Between Two Arrays
• 69. Sqrt(x)
• 744. Find Smallest Letter Greater Than Target
• 278. First Bad Version
• 34. Find First and Last Position of Element in Sorted Array
• 441. Arranging Coins
• 1539. Kth Missing Positive Number
• 167. Two Sum II - Input Array Is Sorted
• 1608. Special Array With X Elements Greater Than or Equal X
• 1351. Count Negative Numbers in a Sorted Matrix
• 74. Search a 2D Matrix
• 1337. The K Weakest Rows in a Matrix
• 1346. Check If N and Its Double Exist
• 350. Intersection of Two Arrays II
• 633. Sum of Square Numbers
• 1855. Maximum Distance Between a Pair of Values
• 33. Search in Rotated Sorted Array
• 153. Find Minimum in Rotated Sorted Array

Binary Search II

📊 Tracking list for Binary Search II

List contains 40 problems (click to expand)

• 209. Minimum Size Subarray Sum
• 611. Valid Triangle Number
• 658. Find K Closest Elements
• 1894. Find the Student that Will Replace the Chalk
• 300. Longest Increasing Subsequence
• 1760. Minimum Limit of Balls in a Bag
• 875. Koko Eating Bananas
• 1552. Magnetic Force Between Two Balls
• 287. Find the Duplicate Number
• 1283. Find the Smallest Divisor Given a Threshold
• 1898. Maximum Number of Removable Characters
• 1870. Minimum Speed to Arrive on Time
• 1482. Minimum Number of Days to Make m Bouquets
• 1818. Minimum Absolute Sum Difference
• 240. Search a 2D Matrix II
• 275. H-Index II
• 1838. Frequency of the Most Frequent Element
• 540. Single Element in a Sorted Array
• 222. Count Complete Tree Nodes
• 1712. Ways to Split Array Into Three Subarrays
• 826. Most Profit Assigning Work
• 436. Find Right Interval
• 81. Search in Rotated Sorted Array II
• 162. Find Peak Element
• 154. Find Minimum in Rotated Sorted Array II
• 528. Random Pick with Weight
• 1508. Range Sum of Sorted Subarray Sums
• 1574. Shortest Subarray to be Removed to Make Array Sorted
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1498. Number of Subsequences That Satisfy the Given Sum Condition
• 981. Time Based Key-Value Store
• 1300. Sum of Mutated Array Closest to Target
• 1802. Maximum Value at a Given Index in a Bounded Array
• 1901. Find a Peak Element II
• 1146. Snapshot Array
• 1488. Avoid Flood in The City
• 1562. Find Latest Group of Size M
• 1648. Sell Diminishing-Valued Colored Balls
• 1201. Ugly Number III
• 911. Online Election

Binary Search III ⭐

List contains 47 problems (click to expand)

• 1213. Intersection of Three Sorted Arrays
• 1099. Two Sum Less Than K
• 1150. Check If a Number Is Majority Element in a Sorted Array
• 1428. Leftmost Column with at Least a One
• 702. Search in a Sorted Array of Unknown Size
• 1011. Capacity To Ship Packages Within D Days
• 1533. Find the Index of the Large Integer
• 1060. Missing Element in Sorted Array
• 270. Closest Binary Search Tree Value
• 1231. Divide Chocolate
• 1891. Cutting Ribbons
• 1885. Count Pairs in Two Arrays
• 1618. Maximum Font to Fit a Sentence in a Screen
• 793. Preimage Size of Factorial Zeroes Function
• 1198. Find Smallest Common Element in All Rows
• 668. Kth Smallest Number in Multiplication Table
• 719. Find K-th Smallest Pair Distance
• 1751. Maximum Number of Events That Can Be Attended II
• 1671. Minimum Number of Removals to Make Mountain Array
• 786. K-th Smallest Prime Fraction
• 1182. Shortest Distance to Target Color
• 1793. Maximum Score of a Good Subarray
• 1095. Find in Mountain Array
• 4. Median of Two Sorted Arrays
• 1235. Maximum Profit in Job Scheduling
• 1713. Minimum Operations to Make a Subsequence
• 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
• 1847. Closest Room
• 363. Max Sum of Rectangle No Larger Than K
• 1862. Sum of Floored Pairs
• 644. Maximum Average Subarray II
• 1889. Minimum Space Wasted From Packaging
• 710. Random Pick with Blacklist
• 352. Data Stream as Disjoint Intervals
• 778. Swim in Rising Water
• 378. Kth Smallest Element in a Sorted Matrix
• 774. Minimize Max Distance to Gas Station
• 1187. Make Array Strictly Increasing
• 1062. Longest Repeating Substring
• 1044. Longest Duplicate Substring
• 718. Maximum Length of Repeated Subarray
• 887. Super Egg Drop
• 1521. Find a Value of a Mysterious Function Closest to Target
• 1157. Online Majority Element In Subarray
• 302. Smallest Rectangle Enclosing Black Pixels
• 1631. Path With Minimum Effort
• 1782. Count Pairs Of Nodes++ +

---

LeetCode 75

Level 1

📊 Tracking list for Level 1

List contains 30 problems (click to expand)

• 1480. Running Sum of 1d Array
• 724. Find Pivot Index
• 205. Isomorphic Strings
• 392. Is Subsequence
• 21. Merge Two Sorted Lists
• 206. Reverse Linked List
• 876. Middle of the Linked List
• 142. Linked List Cycle II
• 121. Best Time to Buy and Sell Stock
• 409. Longest Palindrome
• 589. N-ary Tree Preorder Traversal
• 102. Binary Tree Level Order Traversal
• 704. Binary Search
• 278. First Bad Version
• 98. Validate Binary Search Tree
• 235. Lowest Common Ancestor of a Binary Search Tree
• 733. Flood Fill
• 200. Number of Islands
• 509. Fibonacci Number
• 70. Climbing Stairs
• 746. Min Cost Climbing Stairs
• 62. Unique Paths
• 438. Find All Anagrams in a String
• 424. Longest Repeating Character Replacement
• 1. Two Sum
• 299. Bulls and Cows
• 844. Backspace String Compare
• 394. Decode String
• 1046. Last Stone Weight
• 692. Top K Frequent Words

Level 2

📊 Tracking list for Level 2

List contains 45 problems (click to expand)

• 202. Happy Number
• 54. Spiral Matrix
• 1706. Where Will the Ball Fall
• 14. Longest Common Prefix
• 43. Multiply Strings
• 19. Remove Nth Node From End of List
• 234. Palindrome Linked List
• 328. Odd Even Linked List
• 148. Sort List
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 621. Task Scheduler
• 226. Invert Binary Tree
• 110. Balanced Binary Tree
• 543. Diameter of Binary Tree
• 437. Path Sum III
• 74. Search a 2D Matrix
• 33. Search in Rotated Sorted Array
• 108. Convert Sorted Array to Binary Search Tree
• 230. Kth Smallest Element in a BST
• 173. Binary Search Tree Iterator
• 994. Rotting Oranges
• 417. Pacific Atlantic Water Flow
• 210. Course Schedule II
• 815. Bus Routes
• 198. House Robber
• 322. Coin Change
• 416. Partition Equal Subset Sum
• 152. Maximum Product Subarray
• 3. Longest Substring Without Repeating Characters
• 16. 3Sum Closest
• 76. Minimum Window Substring
• 100. Same Tree
• 101. Symmetric Tree
• 199. Binary Tree Right Side View
• 232. Implement Queue using Stacks
• 155. Min Stack
• 208. Implement Trie (Prefix Tree)
• 57. Insert Interval
• 56. Merge Intervals
• 735. Asteroid Collision
• 227. Basic Calculator II
• 547. Number of Provinces
• 947. Most Stones Removed with Same Row or Column
• 39. Combination Sum
• 46. Permutations

Level 3 ⭐

List contains 65 problems (click to expand)

• 191. Number of 1 Bits
• 136. Single Number
• 90. Subsets II
• 5. Longest Palindromic Substring
• 49. Group Anagrams
• 28. Implement strStr()
• 721. Accounts Merge
• 1584. Min Cost to Connect All Points
• 2. Add Two Numbers
• 24. Swap Nodes in Pairs
• 23. Merge k Sorted Lists
• 61. Rotate List
• 25. Reverse Nodes in k-Group
• 437. Path Sum III
• 124. Binary Tree Maximum Path Sum
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 310. Minimum Height Trees
• 662. Maximum Width of Binary Tree
• 103. Binary Tree Zigzag Level Order Traversal
• 863. All Nodes Distance K in Binary Tree
• 787. Cheapest Flights Within K Stops
• 127. Word Ladder
• 815. Bus Routes
• 981. Time Based Key-Value Store
• 146. LRU Cache
• 460. LFU Cache
• 11. Container With Most Water
• 239. Sliding Window Maximum
• 42. Trapping Rain Water
• 13. Roman to Integer
• 133. Clone Graph
• 150. Evaluate Reverse Polish Notation
• 8. String to Integer (atoi)
• 739. Daily Temperatures
• 84. Largest Rectangle in Histogram
• 139. Word Break
• 542. 01 Matrix
• 221. Maximal Square
• 295. Find Median from Data Stream
• 632. Smallest Range Covering Elements from K Lists
• 78. Subsets
• 17. Letter Combinations of a Phone Number
• 79. Word Search
• 134. Gas Station
• 2244. Minimum Rounds to Complete All Tasks
• 2136. Earliest Possible Day of Full Bloom
• 300. Longest Increasing Subsequence
• 1143. Longest Common Subsequence
• 55. Jump Game
• 329. Longest Increasing Path in a Matrix
• 32. Longest Valid Parentheses
• 528. Random Pick with Weight
• 153. Find Minimum in Rotated Sorted Array
• 658. Find K Closest Elements
• 875. Koko Eating Bananas
• 4. Median of Two Sorted Arrays
• 31. Next Permutation
• 36. Valid Sudoku
• 37. Sudoku Solver
• 211. Design Add and Search Words Data Structure
• 380. Insert Delete GetRandom O(1)
• 297. Serialize and Deserialize Binary Tree
• 224. Basic Calculator
• 15. 3Sum
• 215. Kth Largest Element in an Array

---

SQL

SQL I

📊 Tracking list for SQL I

List contains 33 problems (click to expand)

• 595. Big Countries
• 1757. Recyclable and Low Fat Products
• 584. Find Customer Referee
• 183. Customers Who Never Order
• 1873. Calculate Special Bonus
• 627. Swap Salary
• 196. Delete Duplicate Emails
• 1667. Fix Names in a Table
• 1484. Group Sold Products By The Date
• 1527. Patients With a Condition
• 1965. Employees With Missing Information
• 1795. Rearrange Products Table
• 608. Tree Node
• 176. Second Highest Salary
• 175. Combine Two Tables
• 1581. Customer Who Visited but Did Not Make Any Transactions
• 1148. Article Views I
• 197. Rising Temperature
• 607. Sales Person
• 1141. User Activity for the Past 30 Days I
• 1693. Daily Leads and Partners
• 1729. Find Followers Count
• 586. Customer Placing the Largest Number of Orders
• 511. Game Play Analysis I
• 1890. The Latest Login in 2020
• 1741. Find Total Time Spent by Each Employee
• 1393. Capital Gain/Loss
• 1407. Top Travellers
• 1158. Market Analysis I
• 182. Duplicate Emails
• 1050. Actors and Directors Who Cooperated At Least Three Times
• 1587. Bank Account Summary II
• 1084. Sales Analysis III

SQL II ⭐

List contains 38 problems (click to expand)

• 1699. Number of Calls Between Two Persons
• 1251. Average Selling Price
• 1571. Warehouse Manager
• 1445. Apples & Oranges
• 1193. Monthly Transactions I
• 1633. Percentage of Users Attended a Contest
• 1173. Immediate Food Delivery I
• 1211. Queries Quality and Percentage
• 1607. Sellers With No Sales
• 619. Biggest Single Number
• 1112. Highest Grade For Each Student
• 1398. Customers Who Bought Products A and B but Not C
• 1440. Evaluate Boolean Expression
• 1264. Page Recommendations
• 570. Managers with at Least 5 Direct Reports
• 1303. Find the Team Size
• 1280. Students and Examinations
• 1501. Countries You Can Safely Invest In
• 184. Department Highest Salary
• 580. Count Student Number in Departments
• 1294. Weather Type in Each Country
• 626. Exchange Seats
• 1783. Grand Slam Titles
• 1164. Product Price at a Given Date
• 603. Consecutive Available Seats
• 1731. The Number of Employees Which Report to Each Employee
• 1747. Leetflex Banned Accounts
• 181. Employees Earning More Than Their Managers
• 1459. Rectangles Area
• 180. Consecutive Numbers
• 1988. Find Cutoff Score for Each School
• 1549. The Most Recent Orders for Each Product
• 1321. Restaurant Growth
• 1045. Customers Who Bought All Products
• 1341. Movie Rating
• 1867. Orders With Maximum Quantity Above Average
• 550. Game Play Analysis IV
• 262. Trips and Users

SQL III ⭐

List contains 29 problems (click to expand)

• 1303. Find the Team Size
• 1308. Running Total for Different Genders
• 1501. Countries You Can Safely Invest In
• 1077. Project Employees III
• 1549. The Most Recent Orders for Each Product
• 1285. Find the Start and End Number of Continuous Ranges
• 1596. The Most Frequently Ordered Products for Each Customer
• 178. Rank Scores
• 177. Nth Highest Salary
• 1951. All the Pairs With the Maximum Number of Common Followers
• 1709. Biggest Window Between Visits
• 1949. Strong Friendship
• 1532. The Most Recent Three Orders
• 1126. Active Businesses
• 1831. Maximum Transaction Each Day
• 1613. Find the Missing IDs
• 1270. All People Report to the Given Manager
• 1369. Get the Second Most Recent Activity
• 1412. Find the Quiet Students in All Exams
• 1972. First and Last Call On the Same Day
• 185. Department Top Three Salaries
• 1767. Find the Subtasks That Did Not Execute
• 1384. Total Sales Amount by Year
• 569. Median Employee Salary
• 571. Find Median Given Frequency of Numbers
• 1225. Report Contiguous Dates
• 1454. Active Users
• 618. Students Report By Geography
• 2010. The Number of Seniors and Juniors to Join the Company II