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  - Array.md
  - Backtracking.md
  - Binary Indexed Tree.md
  - Binary Search Tree.md
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  - Bit Manipulation.md
  - Bitmask.md
  - Brainteaser.md
  - Breadth-First Search.md
  - Bucket Sort.md
  - Combinatorics.md
  - Counting Sort.md
  - Counting.md
  - Data Stream.md
  - Database.md
  - Depth-First Search.md
  - Design.md
  - Divide and Conquer.md
  - Doubly-Linked List.md
  - Dynamic Programming.md
  - Game Theory.md
  - Geometry.md
  - Graph.md
  - Greedy.md
  - Hash Function.md
  - Hash Table.md
  - Heap (Priority Queue).md
  - Interactive.md
  - Iterator.md
  - Linked List.md
  - Math.md
  - Matrix.md
  - Memoization.md
  - Merge Sort.md
  - Monotonic Queue.md
  - Monotonic Stack.md
  - Number Theory.md
  - Ordered Set.md
  - Prefix Sum.md
  - Probability and Statistics.md
  - Queue.md
  - Quickselect.md
  - Radix Sort.md
  - Randomized.md
  - Recursion.md
  - Reservoir Sampling.md
  - Rolling Hash.md
  - Segment Tree.md
  - Shortest Path.md
  - Simulation.md
  - Sliding Window.md
  - Sorting.md
  - Stack.md
  - String Matching.md
  - String.md
  - Strongly Connected Component.md
  - Suffix Array.md
  - Topological Sort.md
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  - Trie.md
  - Two Pointers.md
  - Union Find.md
- Daily_Questions.md
- Easy.md
- Hard.md
- Medium.md
- Questions_By_Code_Length.md
- Questions_By_Recent.md
- Topics.md
- Weekly_Questions.md
- _1. Two Sum.md
- _100. Same Tree.md
- _1002. Find Common Characters.md
- _1004. Max Consecutive Ones III.md
- _1006. Clumsy Factorial.md
- _1008. Construct Binary Search Tree from Preorder Traversal.md
- _1018. Binary Prefix Divisible By 5.md
- _1019. Next Greater Node In Linked List.md
- _102. Binary Tree Level Order Traversal.md
- _1020. Number of Enclaves.md
- _1026. Maximum Difference Between Node and Ancestor.md
- _1028. Recover a Tree From Preorder Traversal.md
- _103. Binary Tree Zigzag Level Order Traversal.md
- _1030. Matrix Cells in Distance Order.md
- _1038. Binary Search Tree to Greater Sum Tree.md
- _104. Maximum Depth of Binary Tree.md
- _1046. Last Stone Weight.md
- _1051. Height Checker.md
- _1052. Grumpy Bookstore Owner.md
- _1062. Longest Repeating Substring.md
- _1068. Product Sales Analysis I.md
- _107. Binary Tree Level Order Traversal II.md
- _1071. Greatest Common Divisor of Strings.md
- _1079. Letter Tile Possibilities.md
- _1087. Brace Expansion.md
- _1092. Shortest Common Supersequence .md
- _110. Balanced Binary Tree.md
- _1100. Find K-Length Substrings With No Repeated Characters.md
- _1101. The Earliest Moment When Everyone Become Friends.md
- _1105. Filling Bookcase Shelves.md
- _111. Minimum Depth of Binary Tree.md
- _1110. Delete Nodes And Return Forest.md
- _112. Path Sum.md
- _1122. Relative Sort Array.md
- _113. Path Sum II.md
- _1133. Largest Unique Number.md
- _114. Flatten Binary Tree to Linked List.md
- _1140. Stone Game II.md
- _1151. Minimum Swaps to Group All 1's Together.md
- _1160. Find Words That Can Be Formed by Characters.md
- _1161. Maximum Level Sum of a Binary Tree.md
- _1166. Design File System.md
- _1171. Remove Zero Sum Consecutive Nodes from Linked List.md
- _118. Pascal's Triangle.md
- _1184. Distance Between Bus Stops.md
- _1190. Reverse Substrings Between Each Pair of Parentheses.md
- _1207. Unique Number of Occurrences.md
- _1209. Remove All Adjacent Duplicates in String II.md
- _121. Best Time to Buy and Sell Stock.md
- _1218. Longest Arithmetic Subsequence of Given Difference.md
- _1229. Meeting Scheduler.md
- _1230. Toss Strange Coins.md
- _1232. Check If It Is a Straight Line.md
- _1233. Remove Sub-Folders from the Filesystem.md
- _1239. Maximum Length of a Concatenated String with Unique Characters.md
- _124. Binary Tree Maximum Path Sum.md
- _1248. Count Number of Nice Subarrays.md
- _1249. Minimum Remove to Make Valid Parentheses.md
- _125. Valid Palindrome.md
- _1252. Cells with Odd Values in a Matrix.md
- _1254. Number of Closed Islands.md
- _1255. Maximum Score Words Formed by Letters.md
- _1261. Find Elements in a Contaminated Binary Tree.md
- _1265. Print Immutable Linked List in Reverse.md
- _1267. Count Servers that Communicate.md
- _1268. Search Suggestions System.md
- _128. Longest Consecutive Sequence.md
- _1282. Group the People Given the Group Size They Belong To.md
- _1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix.md
- _129. Sum Root to Leaf Numbers.md
- _13. Roman to Integer.md
- _1302. Deepest Leaves Sum.md
- _1305. All Elements in Two Binary Search Trees.md
- _131. Palindrome Partitioning.md
- _1315. Sum of Nodes with Even-Valued Grandparent.md
- _1317. Convert Integer to the Sum of Two No-Zero Integers.md
- _1325. Delete Leaves With a Given Value.md
- _1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance.md
- _1351. Count Negative Numbers in a Sorted Matrix.md
- _1358. Number of Substrings Containing All Three Characters.md
- _136. Single Number.md
- _1367. Linked List in Binary Tree.md
- _1368. Minimum Cost to Make at Least One Valid Path in a Grid.md
- _1372. Longest ZigZag Path in a Binary Tree.md
- _1376. Time Needed to Inform All Employees.md
- _138. Copy List with Random Pointer.md
- _1380. Lucky Numbers in a Matrix.md
- _1381. Design a Stack With Increment Operation.md
- _1382. Balance a Binary Search Tree.md
- _1395. Count Number of Teams.md
- _14. Longest Common Prefix.md
- _1400. Construct K Palindrome Strings.md
- _1404. Number of Steps to Reduce a Number in Binary Representation to One.md
- _1408. String Matching in an Array.md
- _141. Linked List Cycle.md
- _1415. The k-th Lexicographical String of All Happy Strings of Length n.md
- _142. Linked List Cycle II.md
- _1422. Maximum Score After Splitting a String.md
- _1426. Counting Elements.md
- _1427. Perform String Shifts.md
- _1429. First Unique Number.md
- _143. Reorder List.md
- _1436. Destination City.md
- _1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit.md
- _1442. Count Triplets That Can Form Two Arrays of Equal XOR.md
- _1448. Count Good Nodes in Binary Tree.md
- _145. Binary Tree Postorder Traversal.md
- _1452. People Whose List of Favorite Companies Is Not a Subset of Another List.md
- _1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence.md
- _1457. Pseudo-Palindromic Paths in a Binary Tree.md
- _1460. Make Two Arrays Equal by Reversing Subarrays.md
- _1461. Check If a String Contains All Binary Codes of Size K.md
- _1462. Course Schedule IV.md
- _1470. Shuffle the Array.md
- _1472. Design Browser History.md
- _1474. Delete N Nodes After M Nodes of a Linked List.md
- _1475. Final Prices With a Special Discount in a Shop.md
- _1481. Least Number of Unique Integers after K Removals.md
- _1482. Minimum Number of Days to Make m Bouquets.md
- _1490. Clone N-ary Tree.md
- _1493. Longest Subarray of 1's After Deleting One Element.md
- _1497. Check If Array Pairs Are Divisible by k.md
- _150. Evaluate Reverse Polish Notation.md
- _1502. Can Make Arithmetic Progression From Sequence.md
- _1508. Range Sum of Sorted Subarray Sums.md
- _1509. Minimum Difference Between Largest and Smallest Value in Three Moves.md
- _1518. Water Bottles.md
- _1522. Diameter of N-Ary Tree.md
- _1524. Number of Sub-arrays With Odd Sum.md
- _1525. Number of Good Ways to Split a String.md
- _1530. Number of Good Leaf Nodes Pairs.md
- _1535. Find the Winner of an Array Game.md
- _155. Min Stack.md
- _1550. Three Consecutive Odds.md
- _1551. Minimum Operations to Make Array Equal.md
- _1552. Magnetic Force Between Two Balls.md
- _1561. Maximum Number of Coins You Can Get.md
- _1564. Put Boxes Into the Warehouse I.md
- _1568. Minimum Number of Days to Disconnect Island.md
- _1570. Dot Product of Two Sparse Vectors.md
- _1579. Remove Max Number of Edges to Keep Graph Fully Traversable.md
- _1580. Put Boxes Into the Warehouse II.md
- _1598. Crawler Log Folder.md
- _1602. Find Nearest Right Node in Binary Tree.md
- _1605. Find Valid Matrix Given Row and Column Sums.md
- _1609. Even Odd Tree.md
- _1634. Add Two Polynomials Represented as Linked Lists.md
- _1636. Sort Array by Increasing Frequency.md
- _1641. Count Sorted Vowel Strings.md
- _1642. Furthest Building You Can Reach.md
- _165. Compare Version Numbers.md
- _1650. Lowest Common Ancestor of a Binary Tree III.md
- _1653. Minimum Deletions to Make String Balanced.md
- _1657. Determine if Two Strings Are Close.md
- _166. Fraction to Recurring Decimal.md
- _1660. Correct a Binary Tree.md
- _1669. Merge In Between Linked Lists.md
- _167. Two Sum II - Input Array Is Sorted.md
- _1676. Lowest Common Ancestor of a Binary Tree IV.md
- _1684. Count the Number of Consistent Strings.md
- _1689. Partitioning Into Minimum Number Of Deci-Binary Numbers.md
- _1696. Jump Game VI.md
- _1698. Number of Distinct Substrings in a String.md
- _17. Letter Combinations of a Phone Number.md
- _170. Two Sum III - Data structure design.md
- _1700. Number of Students Unable to Eat Lunch.md
- _1701. Average Waiting Time.md
- _1717. Maximum Score From Removing Substrings.md
- _1718. Construct the Lexicographically Largest Valid Sequence.md
- _1721. Swapping Nodes in a Linked List.md
- _173. Binary Search Tree Iterator.md
- _1730. Shortest Path to Get Food.md
- _1736. Latest Time by Replacing Hidden Digits.md
- _1740. Find Distance in a Binary Tree.md
- _1743. Restore the Array From Adjacent Pairs.md
- _1748. Sum of Unique Elements.md
- _1749. Maximum Absolute Sum of Any Subarray.md
- _175. Combine Two Tables.md
- _1752. Check if Array Is Sorted and Rotated.md
- _1756. Design Most Recently Used Queue.md
- _1759. Count Number of Homogenous Substrings.md
- _176. Second Highest Salary.md
- _1762. Buildings With an Ocean View.md
- _1768. Merge Strings Alternately.md
- _177. Nth Highest Salary.md
- _1780. Check if Number is a Sum of Powers of Three.md
- _1783. Grand Slam Titles.md
- _1791. Find Center of Star Graph.md
- _1800. Maximum Ascending Subarray Sum.md
- _1804. Implement Trie II (Prefix Tree).md
- _181. Employees Earning More Than Their Managers.md
- _182. Duplicate Emails.md
- _1822. Sign of the Product of an Array.md
- _1823. Find the Winner of the Circular Game.md
- _183. Customers Who Never Order.md
- _1833. Maximum Ice Cream Bars.md
- _1836. Remove Duplicates From an Unsorted Linked List.md
- _184. Department Highest Salary.md
- _1844. Replace All Digits with Characters.md
- _1852. Distinct Numbers in Each Subarray.md
- _1858. Longest Word With All Prefixes.md
- _1874. Minimize Product Sum of Two Arrays.md
- _1877. Minimize Maximum Pair Sum in Array.md
- _1884. Egg Drop With 2 Eggs and N Floors.md
- _1885. Count Pairs in Two Arrays.md
- _189. Rotate Array.md
- _19. Remove Nth Node From End of List.md
- _1905. Count Sub Islands.md
- _1909. Remove One Element to Make the Array Strictly Increasing.md
- _191. Number of 1 Bits.md
- _1910. Remove All Occurrences of a Substring.md
- _1929. Concatenation of Array.md
- _1940. Longest Common Subsequence Between Sorted Arrays.md
- _1945. Sum of Digits of String After Convert.md
- _1957. Delete Characters to Make Fancy String.md
- _196. Delete Duplicate Emails.md
- _197. Rising Temperature.md
- _1973. Count Nodes Equal to Sum of Descendants.md
- _198. House Robber.md
- _1980. Find Unique Binary String.md
- _199. Binary Tree Right Side View.md
- _1992. Find All Groups of Farmland.md
- _2. Add Two Numbers.md
- _20. Valid Parentheses.md
- _200. Number of Islands.md
- _2011. Final Value of Variable After Performing Operations.md
- _2013. Detect Squares.md
- _2037. Minimum Number of Moves to Seat Everyone.md
- _2045. Second Minimum Time to Reach Destination.md
- _2046. Sort Linked List Already Sorted Using Absolute Values.md
- _2053. Kth Distinct String in an Array.md
- _2058. Find the Minimum and Maximum Number of Nodes Between Critical Points.md
- _206. Reverse Linked List.md
- _2063. Vowels of All Substrings.md
- _208. Implement Trie (Prefix Tree).md
- _2083. Substrings That Begin and End With the Same Letter.md
- _2086. Minimum Number of Food Buckets to Feed the Hamsters.md
- _2093. Minimum Cost to Reach City With Discounts.md
- _2095. Delete the Middle Node of a Linked List.md
- _2096. Step-By-Step Directions From a Binary Tree Node to Another.md
- _21. Merge Two Sorted Lists.md
- _211. Design Add and Search Words Data Structure.md
- _212. Word Search II.md
- _213. House Robber II.md
- _2130. Maximum Twin Sum of a Linked List.md
- _2134. Minimum Swaps to Group All 1's Together II.md
- _2149. Rearrange Array Elements by Sign.md
- _2161. Partition Array According to Given Pivot.md
- _2165. Smallest Value of the Rearranged Number.md
- _217. Contains Duplicate.md
- _2181. Merge Nodes in Between Zeros.md
- _2191. Sort the Jumbled Numbers.md
- _2192. All Ancestors of a Node in a Directed Acyclic Graph.md
- _2196. Create Binary Tree From Descriptions.md
- _22. Generate Parentheses.md
- _2206. Divide Array Into Equal Pairs.md
- _2211. Count Collisions on a Road.md
- _2221. Find Triangular Sum of an Array.md
- _2225. Find Players With Zero or One Losses.md
- _224. Basic Calculator.md
- _2248. Intersection of Multiple Arrays.md
- _2258. Escape the Spreading Fire.md
- _226. Invert Binary Tree.md
- _2265. Count Nodes Equal to Average of Subtree.md
- _2268. Minimum Number of Keypresses.md
- _227. Basic Calculator II.md
- _2285. Maximum Total Importance of Roads.md
- _23. Merge k Sorted Lists.md
- _230. Kth Smallest Element in a BST.md
- _2304. Minimum Path Cost in a Grid.md
- _231. Power of Two.md
- _2317. Maximum XOR After Operations .md
- _2342. Max Sum of a Pair With Equal Sum of Digits.md
- _2349. Design a Number Container System.md
- _235. Lowest Common Ancestor of a Binary Search Tree.md
- _2352. Equal Row and Column Pairs.md
- _236. Lowest Common Ancestor of a Binary Tree.md
- _2365. Task Scheduler II.md
- _2374. Node With Highest Edge Score.md
- _2375. Construct Smallest Number From DI String.md
- _2379. Minimum Recolors to Get K Consecutive Black Blocks.md
- _238. Product of Array Except Self.md
- _2385. Amount of Time for Binary Tree to Be Infected.md
- _2389. Longest Subsequence With Limited Sum.md
- _239. Sliding Window Maximum.md
- _2390. Removing Stars From a String.md
- _2392. Build a Matrix With Conditions.md
- _2393. Count Strictly Increasing Subarrays.md
- _2395. Find Subarrays With Equal Sum.md
- _2396. Strictly Palindromic Number.md
- _24. Swap Nodes in Pairs.md
- _2405. Optimal Partition of String.md
- _2415. Reverse Odd Levels of Binary Tree.md
- _2416. Sum of Prefix Scores of Strings.md
- _2418. Sort the People.md
- _242. Valid Anagram.md
- _2423. Remove Letter To Equalize Frequency.md
- _2425. Bitwise XOR of All Pairings.md
- _2433. Find The Original Array of Prefix Xor.md
- _2451. Odd String Difference.md
- _2455. Average Value of Even Numbers That Are Divisible by Three.md
- _2458. Height of Binary Tree After Subtree Removal Queries.md
- _2460. Apply Operations to an Array.md
- _2473. Minimum Cost to Buy Apples.md
- _2482. Difference Between Ones and Zeros in Row and Column.md
- _2486. Append Characters to String to Make Subsequence.md
- _2487. Remove Nodes From Linked List.md
- _2493. Divide Nodes Into the Maximum Number of Groups.md
- _25. Reverse Nodes in k-Group.md
- _2501. Longest Square Streak in an Array.md
- _251. Flatten 2D Vector.md
- _2523. Closest Prime Numbers in Range.md
- _2529. Maximum Count of Positive Integer and Negative Integer.md
- _2545. Sort the Students by Their Kth Score.md
- _2570. Merge Two 2D Arrays by Summing Values.md
- _2579. Count Total Number of Colored Cells.md
- _2582. Pass the Pillow.md
- _2583. Kth Largest Sum in a Binary Tree.md
- _2594. Minimum Time to Repair Cars.md
- _2599. Make the Prefix Sum Non-negative.md
- _26. Remove Duplicates from Sorted Array.md
- _260. Single Number III.md
- _261. Graph Valid Tree.md
- _2610. Convert an Array Into a 2D Array With Conditions.md
- _2619. Array Prototype Last.md
- _2620. Counter.md
- _2621. Sleep.md
- _2623. Memoize.md
- _2624. Snail Traversal.md
- _2626. Array Reduce Transformation.md
- _2629. Function Composition.md
- _2634. Filter Elements from Array.md
- _2635. Apply Transform Over Each Element in Array.md
- _2658. Maximum Number of Fish in a Grid.md
- _266. Palindrome Permutation.md
- _2661. First Completely Painted Row or Column.md
- _2664. The Knight’s Tour.md
- _2665. Counter II.md
- _2666. Allow One Function Call.md
- _2667. Create Hello World Function.md
- _2671. Frequency Tracker.md
- _2678. Number of Senior Citizens.md
- _2679. Sum in a Matrix.md
- _2683. Neighboring Bitwise XOR.md
- _2684. Maximum Number of Moves in a Grid.md
- _2698. Find the Punishment Number of an Integer.md
- _27. Remove Element.md
- _2703. Return Length of Arguments Passed.md
- _2704. To Be Or Not To Be.md
- _271. Encode and Decode Strings.md
- _272. Closest Binary Search Tree Value II.md
- _2723. Add Two Promises.md
- _273. Integer to English Words.md
- _2734. Lexicographically Smallest String After Substring Operation.md
- _2743. Count Substrings Without Repeating Character.md
- _2751. Robot Collisions.md
- _2796. Repeat String.md
- _28. Find the Index of the First Occurrence in a String.md
- _2807. Insert Greatest Common Divisors in Linked List.md
- _2816. Double a Number Represented as a Linked List.md
- _2852. Sum of Remoteness of All Cells.md
- _286. Walls and Gates.md
- _287. Find the Duplicate Number.md
- _2886. Change Data Type.md
- _2894. Divisible and Non-divisible Sums Difference.md
- _292. Nim Game.md
- _2942. Find Words Containing Character.md
- _2954. Count the Number of Infection Sequences.md
- _2955. Number of Same-End Substrings.md
- _2965. Find Missing and Repeated Values.md
- _2976. Minimum Cost to Convert String I.md
- _2979. Most Expensive Item That Can Not Be Bought.md
- _2997. Minimum Number of Operations to Make Array XOR Equal to K.md
- _3. Longest Substring Without Repeating Characters.md
- _3016. Minimum Number of Pushes to Type Word II.md
- _3043. Find the Length of the Longest Common Prefix.md
- _3045. Count Prefix and Suffix Pairs II.md
- _3064. Guess the Number Using Bitwise Questions I.md
- _3066. Minimum Operations to Exceed Threshold Value II.md
- _3074. Apple Redistribution into Boxes.md
- _3105. Longest Strictly Increasing or Strictly Decreasing Subarray.md
- _3106. Lexicographically Smallest String After Operations With Constraint.md
- _3110. Score of a String.md
- _3111. Minimum Rectangles to Cover Points.md
- _3136. Valid Word.md
- _314. Binary Tree Vertical Order Traversal.md
- _3151. Special Array I.md
- _3157. Find the Level of Tree with Minimum Sum.md
- _3160. Find the Number of Distinct Colors Among the Balls.md
- _3163. String Compression III.md
- _3168. Minimum Number of Chairs in a Waiting Room.md
- _3169. Count Days Without Meetings.md
- _3174. Clear Digits.md
- _3175. Find The First Player to win K Games in a Row.md
- _3178. Find the Child Who Has the Ball After K Seconds.md
- _3179. Find the N-th Value After K Seconds.md
- _3180. Maximum Total Reward Using Operations I.md
- _3184. Count Pairs That Form a Complete Day I.md
- _3185. Count Pairs That Form a Complete Day II.md
- _3186. Maximum Total Damage With Spell Casting.md
- _3189. Minimum Moves to Get a Peaceful Board.md
- _3190. Find Minimum Operations to Make All Elements Divisible by Three.md
- _3191. Minimum Operations to Make Binary Array Elements Equal to One I.md
- _3192. Minimum Operations to Make Binary Array Elements Equal to One II.md
- _3194. Minimum Average of Smallest and Largest Elements.md
- _3195. Find the Minimum Area to Cover All Ones I.md
- _3196. Maximize Total Cost of Alternating Subarrays.md
- _320. Generalized Abbreviation.md
- _3210. Find the Encrypted String.md
- _3211. Generate Binary Strings Without Adjacent Zeros.md
- _3212. Count Submatrices With Equal Frequency of X and Y.md
- _3213. Construct String with Minimum Cost.md
- _3217. Delete Nodes From Linked List Present in Array.md
- _322. Coin Change.md
- _3226. Number of Bit Changes to Make Two Integers Equal.md
- _3226. Question 3226.md
- _3227. Question 3227.md
- _3227. Vowels Game in a String.md
- _3228. Maximum Number of Operations to Move Ones to the End.md
- _3228. Question 3228.md
- _3229. Minimum Operations to Make Array Equal to Target.md
- _3229. Question 3229.md
- _3232. Find if Digit Game Can Be Won.md
- _3232. Question 3232.md
- _3233. Find the Count of Numbers Which Are Not Special.md
- _3233. Question 3233.md
- _3238. Find the Number of Winning Players.md
- _3238. Question 3238.md
- _3239. Minimum Number of Flips to Make Binary Grid Palindromic I.md
- _3239. Question 3239.md
- _3240. Minimum Number of Flips to Make Binary Grid Palindromic II.md
- _3240. Question 3240.md
- _3242. Design Neighbor Sum Service.md
- _3248. Snake in Matrix.md
- _3249. Count the Number of Good Nodes.md
- _326. Power of Three.md
- _328. Odd Even Linked List.md
- _3289. Question 3289.md
- _33. Search in Rotated Sorted Array.md
- _330. Patching Array.md
- _3306. Count of Substrings Containing Every Vowel and K Consonants II.md
- _339. Nested List Weight Sum.md
- _341. Flatten Nested List Iterator.md
- _342. Power of Four.md
- _344. Reverse String.md
- _3443. Maximum Manhattan Distance After K Changes.md
- _345. Reverse Vowels of a String.md
- _3460. Longest Common Prefix After at Most One Removal.md
- _3460. Question 3460.md
- _347. Top K Frequent Elements.md
- _348. Design Tic-Tac-Toe.md
- _350. Intersection of Two Arrays II.md
- _351. Android Unlock Patterns.md
- _353. Design Snake Game.md
- _36. Valid Sudoku.md
- _362. Design Hit Counter.md
- _364. Nested List Weight Sum II.md
- _366. Find Leaves of Binary Tree.md
- _369. Plus One Linked List.md
- _374. Guess Number Higher or Lower.md
- _380. Insert Delete GetRandom O(1).md
- _381. Insert Delete GetRandom O(1) - Duplicates allowed.md
- _382. Linked List Random Node.md
- _384. Shuffle an Array.md
- _39. Combination Sum.md
- _392. Is Subsequence.md
- _394. Decode String.md
- _40. Combination Sum II.md
- _408. Valid Word Abbreviation.md
- _409. Longest Palindrome.md
- _412. Fizz Buzz.md
- _414. Third Maximum Number.md
- _419. Battleships in a Board.md
- _42. Trapping Rain Water.md
- _424. Longest Repeating Character Replacement.md
- _426. Convert Binary Search Tree to Sorted Doubly Linked List.md
- _429. N-ary Tree Level Order Traversal.md
- _430. Flatten a Multilevel Doubly Linked List.md
- _431. Encode N-ary Tree to Binary Tree.md
- _437. Path Sum III.md
- _443. String Compression.md
- _450. Delete Node in a BST.md
- _451. Sort Characters By Frequency.md
- _46. Permutations.md
- _475. Heaters.md
- _476. Number Complement.md
- _48. Rotate Image.md
- _480. Sliding Window Median.md
- _487. Max Consecutive Ones II.md
- _49. Group Anagrams.md
- _5. Longest Palindromic Substring.md
- _50. Pow(x, n).md
- _502. IPO.md
- _503. Next Greater Element II.md
- _509. Fibonacci Number.md
- _513. Find Bottom Left Tree Value.md
- _523. Continuous Subarray Sum.md
- _53. Maximum Subarray.md
- _535. Encode and Decode TinyURL.md
- _54. Spiral Matrix.md
- _540. Single Element in a Sorted Array.md
- _542. 01 Matrix.md
- _543. Diameter of Binary Tree.md
- _559. Maximum Depth of N-ary Tree.md
- _56. Merge Intervals.md
- _565. Array Nesting.md
- _567. Permutation in String.md
- _57. Insert Interval.md
- _572. Subtree of Another Tree.md
- _577. Employee Bonus.md
- _584. Find Customer Referee.md
- _586. Customer Placing the Largest Number of Orders.md
- _590. N-ary Tree Postorder Traversal.md
- _595. Big Countries.md
- _596. Classes More Than 5 Students.md
- _605. Can Place Flowers.md
- _606. Construct String from Binary Tree.md
- _607. Sales Person.md
- _61. Rotate List.md
- _611. Valid Triangle Number.md
- _616. Add Bold Tag in String.md
- _619. Biggest Single Number.md
- _622. Design Circular Queue.md
- _624. Maximum Distance in Arrays.md
- _636. Exclusive Time of Functions.md
- _637. Average of Levels in Binary Tree.md
- _641. Design Circular Deque.md
- _645. Set Mismatch.md
- _647. Palindromic Substrings.md
- _648. Replace Words.md
- _650. 2 Keys Keyboard.md
- _651. 4 Keys Keyboard.md
- _653. Two Sum IV - Input is a BST.md
- _654. Maximum Binary Tree.md
- _66. Plus One.md
- _662. Maximum Width of Binary Tree.md
- _663. Equal Tree Partition.md
- _664. Strange Printer.md
- _665. Non-decreasing Array.md
- _666. Path Sum IV.md
- _676. Implement Magic Dictionary.md
- _684. Redundant Connection.md
- _687. Longest Univalue Path.md
- _69. Sqrt(x).md
- _690. Employee Importance.md
- _692. Top K Frequent Words.md
- _695. Max Area of Island.md
- _7. Reverse Integer.md
- _70. Climbing Stairs.md
- _700. Search in a Binary Search Tree.md
- _703. Kth Largest Element in a Stream.md
- _707. Design Linked List.md
- _708. Insert into a Sorted Circular Linked List.md
- _71. Simplify Path.md
- _713. Subarray Product Less Than K.md
- _719. Find K-th Smallest Pair Distance.md
- _720. Longest Word in Dictionary.md
- _725. Split Linked List in Parts.md
- _726. Number of Atoms.md
- _729. My Calendar I.md
- _735. Asteroid Collision.md
- _739. Daily Temperatures.md
- _74. Search a 2D Matrix.md
- _743. Network Delay Time.md
- _744. Find Smallest Letter Greater Than Target.md
- _746. Min Cost Climbing Stairs.md
- _75. Sort Colors.md
- _758. Bold Words in String.md
- _77. Combinations.md
- _771. Jewels and Stones.md
- _776. Split BST.md
- _78. Subsets.md
- _784. Letter Case Permutation.md
- _79. Word Search.md
- _791. Custom Sort String.md
- _794. Valid Tic-Tac-Toe State.md
- _796. Rotate String.md
- _797. All Paths From Source to Target.md
- _8. String to Integer (atoi).md
- _807. Max Increase to Keep City Skyline.md
- _81. Search in Rotated Sorted Array II.md
- _817. Linked List Components.md
- _819. Most Common Word.md
- _82. Remove Duplicates from Sorted List II.md
- _826. Most Profit Assigning Work.md
- _827. Making A Large Island.md
- _83. Remove Duplicates from Sorted List.md
- _84. Largest Rectangle in Histogram.md
- _840. Magic Squares In Grid.md
- _846. Hand of Straights.md
- _848. Shifting Letters.md
- _849. Maximize Distance to Closest Person.md
- _853. Car Fleet.md
- _856. Score of Parentheses.md
- _860. Lemonade Change.md
- _861. Score After Flipping Matrix.md
- _863. All Nodes Distance K in Binary Tree.md
- _867. Transpose Matrix.md
- _877. Stone Game.md
- _885. Spiral Matrix III.md
- _890. Find and Replace Pattern.md
- _894. All Possible Full Binary Trees.md
- _895. Maximum Frequency Stack.md
- _9. Palindrome Number.md
- _90. Subsets II.md
- _909. Snakes and Ladders.md
- _912. Sort an Array.md
- _919. Complete Binary Tree Inserter.md
- _921. Minimum Add to Make Parentheses Valid.md
- _930. Binary Subarrays With Sum.md
- _938. Range Sum of BST.md
- _94. Binary Tree Inorder Traversal.md
- _942. DI String Match.md
- _945. Minimum Increment to Make Array Unique.md
- _946. Validate Stack Sequences.md
- _950. Reveal Cards In Increasing Order.md
- _951. Flip Equivalent Binary Trees.md
- _959. Regions Cut By Slashes.md
- _973. K Closest Points to Origin.md
- _974. Subarray Sums Divisible by K.md
- _977. Squares of a Sorted Array.md
- _979. Distribute Coins in Binary Tree.md
- _98. Validate Binary Search Tree.md
- _981. Time Based Key-Value Store.md
- _987. Vertical Order Traversal of a Binary Tree.md
- _993. Cousins in Binary Tree.md
- _994. Rotting Oranges.md
- _995. Minimum Number of K Consecutive Bit Flips.md
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Combinatorics.md

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#	Title	Level	Cats	Solution	Languages	Date Complete
1641	Count Sorted Vowel Strings	Medium		solution	c, cpp, java	Jun 24, 2024
2063	Vowels of All Substrings	Medium		solution	py	Mar 11, 2025
2221	Find Triangular Sum of an Array	Medium		solution	c, java	Jun 27, 2024
2954	Count the Number of Infection Sequences	Hard		solution	py	Jun 26, 2024
3179	Weekly Contest 401 - q2 - Find the N-th Value After K Seconds	Medium	Contest	solution	py	Jul 07, 2024

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