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Cracking Leetcode
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  • 😎Welcome to TimmyBeef's Cracking Leetcode
  • Recursion tips
  • Atlas
  • 3 pointers
  • two pointer
    • Tips
    • 881. Boats to Save People
    • 11. Container With Most Water
    • 27. Remove Element
    • 42. Trapping Rain Water
    • 167. Two Sum II - Input array is sorted
    • 15. 3Sum
    • 611. Valid Triangle Number
    • 18. 4Sum
    • Page 6
    • 344. Reverse String
    • 345. Reverse Vowels of a String
    • 392. Is Subsequence
    • 763. Partition Labels
    • 844. Backspace String Compare
    • 925. Long Pressed Name
    • 977. Squares of a Sorted Array
    • 986. Interval List Intersections
    • Same direction, from start
    • Lintcode - 610. Two Sum - Difference equals to target
    • Lintcode - 1870 · Number of Substrings with All Zeroes
    • 283. Move Zeroes
    • 1513. Number of Substrings With Only 1s
    • 26. Remove Duplicates from Sorted Array
    • sliding win - subarray type
    • sliding window
    • Page 7
    • 1423. Maximum Points You Can Obtain from Cards
    • 643. Maximum Average Subarray I
    • 1176. Diet Plan Performance
    • 125. Valid Palindrome
    • 2108. Find First Palindromic String in the Array
    • 2109. Adding Spaces to a String
    • 2110. Number of Smooth Descent Periods of a Stock
    • 209. Minimum Size Subarray Sum
    • 777. Swap Adjacent in LR String
    • lintcode 1375 · Substring With At Least K Distinct Characters
    • 443. String Compression
    • 1855. Maximum Distance Between a Pair of Values
    • 80. Remove Duplicates from Sorted Array II
    • 26. Remove Duplicates from Sorted Array
    • summaryRanges
    • 5. Longest Palindromic Substring
    • 647. Palindromic Substrings
    • Page 13
  • stack & queue
    • tips
    • 1963. Minimum Number of Swaps to Make the String Balanced
    • 962. Maximum Width Ramp
    • 1249. Minimum Remove to Make Valid Parentheses
    • 232. Implement Queue using Stacks
    • 20. Valid Parentheses
    • 155. Min Stack
    • 394. Decode String
    • 856. Score of Parentheses
    • 224. Basic Calculator
    • 227. Basic Calculator II
    • 946. Validate Stack Sequences
    • 150. Evaluate Reverse Polish Notation
    • 2434. Using a Robot to Print the Lexicographically Smallest String
    • Queue
    • 950. Reveal Cards In Increasing Order
  • Tree
    • N-ary
    • 1261. Find Elements in a Contaminated Binary Tree
    • 2458. Height of Binary Tree After Subtree Removal Queries
    • 2641. Cousins in Binary Tree II
    • 998. Maximum Binary Tree II
    • 1367. Linked List in Binary Tree
    • 1506. Find Root of N-Ary Tree
    • BST
    • Binary Tree classic
    • BST classic
    • tips
    • 1028. Recover a Tree From Preorder Traversal
    • 971. Flip Binary Tree To Match Preorder Traversal
    • (specail) 314. Binary Tree Vertical Order Traversal
    • (314 followup) 987. Vertical Order Traversal of a Binary Tree
    • 655. Print Binary Tree
    • (bfs)993. Cousins in Binary Tree
    • 94. Binary Tree Inorder Traversal
    • 102. Binary Tree Level Order Traversal (BFS)
    • 114. Flatten Binary Tree to Linked List
    • 144. Binary Tree Preorder Traversal
    • 145. Binary Tree Postorder Traversal
    • preorder
    • 100. Same Tree
    • 101. Symmetric Tree
    • 230. Kth Smallest Element in a BST
    • 257. Binary Tree Paths
    • 112. Path Sum
    • 113. Path Sum II
    • 129. Sum Root to Leaf Numbers (example)
    • 404. Sum of Left Leaves (example)
    • 111. Minimum Depth of Binary Tree
    • 104. Maximum Depth of Binary Tree (divide & conquer)
    • 110. Balanced Binary Tree (divide & conquer)
    • 543. Diameter of Binary Tree
    • 1522. Diameter of N-Ary Tree
    • 687. Longest Univalue Path
    • 515. Find Largest Value in Each Tree Row (BFS)
    • 572. Subtree of Another Tree
    • 589. N-ary Tree Preorder Traversal
    • 590. N-ary Tree Postorder Traversal
    • 617. Merge Two Binary Trees
    • 700. Search in a Binary Search Tree
    • 112. Path Sum
    • 124. Binary Tree Maximum Path Sum
    • 199. Binary Tree Right Side View -BFS
    • 437. Path Sum III
    • 98. Validate Binary Search Tree
    • 270. Closest Binary Search Tree Value
    • 272. Closest Binary Search Tree Value II
    • 173. Binary Search Tree Iterator (stack)
    • 938. Range Sum of BST
    • LCA
    • 863. All Nodes Distance K in Binary Tree
    • 652. Find Duplicate Subtrees
    • 366. Find Leaves of Binary Tree
    • 606. Construct String from Binary Tree
    • 285. Inorder Successor in BST
    • 545. Boundary of Binary Tree
    • 582. Kill Process
    • 337. House Robber III
    • 2265. Count Nodes Equal to Average of Subtree
  • DFS & BFS
    • Eulerian paths
    • Tips
    • Graph I
    • Graph II
    • 3481. Apply Substitutions
    • 988. Smallest String Starting From Leaf
    • 463. Island Perimeter (actually counting
    • 997. Find the Town Judge
    • 1042. Flower Planting With No Adjacent
    • 332. Reconstruct Itinerary
    • Generic DFS
    • DFS
    • 582. Kill Process
    • BFS
    • 247. Strobogrammatic Number II
  • Binary Search (BS)
    • Template & Tips
    • 540. Single Element in a Sorted Array
    • 2594. Minimum Time to Repair Cars
    • 2226. Maximum Candies Allocated to K Children
    • 274. H-Index
    • 剑指 Offer 53 - II. 0~n-1中缺失的数字
    • 704. Binary Search
    • 33. Search in Rotated Sorted Array
    • 34. Find First and Last Position of Element in Sorted Array
    • 81. Search in Rotated Sorted Array II
    • 35. Search Insert Position
    • 69. Sqrt(x)
    • 74. Search a 2D Matrix
    • 240. Search a 2D Matrix II
    • 278. First Bad Version
    • 349. Intersection of Two Arrays
    • 374. Guess Number Higher or Lower
    • 153. Find Minimum in Rotated Sorted Array
    • 154. Find Minimum in Rotated Sorted Array II
    • 162. Find Peak Element
    • 528. Random Pick with Weight
    • 1428. Leftmost Column with at Least a One
    • 108. Convert Sorted Array to Binary Search Tree
    • 852. Peak Index in a Mountain Array
    • 658. Find K Closest Elements
    • 1891. Cutting Ribbons
    • Lintcode - 610. Two Sum - Difference equals to target
    • State machine or Binary search
    • 475. Heaters
    • 410. Split Array Largest Sum
    • 1539. Kth Missing Positive Number
    • 1060. Missing Element in Sorted Array
    • 702. Search in a Sorted Array of Unknown Size
    • 1618. Maximum Font to Fit a Sentence in a Screen
    • New way:
    • 875. Koko Eating Bananas
    • 2517. Maximum Tastiness of Candy Basket ( 類似2616
    • 1011. Capacity To Ship Packages Within D Days
    • 911. Online Election
    • 1482. Minimum Number of Days to Make m Bouquets
    • 1552. Magnetic Force Between Two Balls
  • Greedy
    • 670. Maximum Swap
    • 1605. Find Valid Matrix Given Row and Column Sums
    • 330. Patching Array
    • (same as 330) 2952. Minimum Number of Coins to be Added
    • 1404. Number of Steps to Reduce a Number in Binary Representation to One
    • 55. Jump Game
    • 45. Jump Game II
    • 122. Best Time to Buy and Sell Stock II
    • 134. Gas Station
    • 135. Candy
    • 1840. Maximum Building Height
    • 452. Minimum Number of Arrows to Burst Balloons
    • 455. Assign Cookies
    • 659. Split Array into Consecutive Subsequences
    • 860. Lemonade Change
    • 874. Walking Robot Simulation
    • 1029. Two City Scheduling
    • 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
    • 1710. Maximum Units on a Truck
    • 767. Reorganize String
    • lintcode 1871 · Maximum moment
    • 1564. Put Boxes Into the Warehouse I
    • 1580. Put Boxes Into the Warehouse II
    • 921. Minimum Add to Make Parentheses Valid
    • 1167. Minimum Cost to Connect Sticks
    • 871. Minimum Number of Refueling Stops
    • 807. Max Increase to Keep City Skyline
    • 670. Maximum Swap
    • 1675. Minimize Deviation in Array (pq or TreeSet
    • 1567. Maximum Length of Subarray With Positive Product
    • 926. Flip String to Monotone Increasing
    • 2214. Minimum Health to Beat Game
    • 1686. Stone Game VI
  • Divide and Conquer
    • 169. Majority Element
    • 4. Median of Two Sorted Arrays
  • Linked List
    • 2807. Insert Greatest Common Divisors in Linked List
    • 725. Split Linked List in Parts
    • 143. Reorder List
    • 19. Remove Nth Node From End of List
    • 21. Merge Two Sorted Lists
    • 23. Merge k Sorted Lists
    • 141. Linked List Cycle
    • 160. Intersection of Two Linked Lists
    • 206. Reverse Linked List
    • 876. Middle of the Linked List
    • 234. Palindrome Linked List
    • 2816. Double a Number Represented as a Linked List
    • 369. Plus One Linked List
  • Dynamic programming (DP)
    • 2327. Number of People Aware of a Secret
    • 1639. Number of Ways to Form a Target String Given a Dictionary
    • Prefix & each position substring
    • 1395. Count Number of Teams
    • 873. Length of Longest Fibonacci Subsequence
    • 741. Cherry Pickup
    • 2222. Number of Ways to Select Buildings
    • 1043. Partition Array for Maximum Sum
    • 1335. Minimum Difficulty of a Job Schedule
    • 2919. Minimum Increment Operations to Make Array
    • 823. Binary Trees With Factors
    • 174. Dungeon Game
    • 396. Rotate Function
    • 467. Unique Substrings in Wraparound String
    • How to save space complexity?
    • tips
    • 509. Fibonacci Number
    • 53. Maximum Subarray (1D-dp)
    • 53. Maximum Subarray (kadane-algo
    • 918. Maximum Sum Circular Subarray (kadane-algo)
    • 2036. Maximum Alternating Subarray Sum (kadane-algo)
    • 152. Maximum Product Subarray (1d-dp)
    • 70. Climbing Stairs (1D-dp)
    • 91. Decode Ways
    • 62. Unique Paths (2D-dp)
    • 63. Unique Paths II (2D-dp)
    • 118. Pascal's Triangle
    • 119. Pascal's Triangle II
    • 2221. Find Triangular Sum of an Array
    • 120. Triangle (1d)
    • 264. Ugly Number II
    • 313. Super Ugly Number
    • LIS
    • 198. House Robber (1d to 2d, 1d, fib)
    • 213. House Robber II
    • 256. Paint House
    • 276. Paint Fence
    • stock tips
    • 1411. Number of Ways to Paint N × 3 Grid
    • 72. Edit Distance
    • 1155. Number of Dice Rolls With Target Sum
    • 區間 dp
    • 322. Coin Change
    • 518. Coin Change 2 (Unbounded Knapsack problem)
    • 01 Knapsack
    • Pattern Matching DP
    • math
    • Specail - square DP
    • 3623. Count Number of Trapezoids I
    • 1048. Longest String Chain
    • 931. Minimum Falling Path Sum
    • 1289. Minimum Falling Path Sum II
    • 1937. Maximum Number of Points with Cost
    • 562. Longest Line of Consecutive One in Matrix (3D DP)
    • 413. Arithmetic Slices
    • 446. Arithmetic Slices II - Subsequence
  • 1218. Longest Arithmetic Subsequence of Given Difference
  • 940. Distinct Subsequences II
  • 552. Student Attendance Record II
  • 664. Strange Printer (區間型 dp
  • 1130. Minimum Cost Tree From Leaf Values (區間型
  • 403. Frog Jump
  • 494. Target Sum
  • (array, can be dp)1014. Best Sightseeing Pair
  • 139. Word Break
  • 140. Word Break II (backtracking)
  • 472. Concatenated Words
  • Page 10
  • 139. Word Break
  • 140. Word Break II
  • 1387. Sort Integers by The Power Value
  • 894. All Possible Full Binary Trees
  • Binary search + Robin karp(rolling hash)
  • HashTable, HashMap, HashSet
    • (interesting one) 1002. Find Common Characters
    • 1171. Remove Zero Sum Consecutive Nodes from Linked List
    • 1647. Minimum Deletions to Make Character Frequencies Unique
    • 1481. Least Number of Unique Integers after K Removals
    • Page 8
    • 2131. Longest Palindrome by Concatenating Two Letter Words
    • 1679. Max Number of K-Sum Pairs
    • 1. Two Sum
    • 36. Valid Sudoku
    • 49. Group Anagrams
    • 170. Two Sum III - Data structure design
    • 454. 4Sum II
    • 242. Valid Anagram
    • 243. Shortest Word Distance
    • 244. Shortest Word Distance II
    • 245. Shortest Word Distance III
    • 350. Intersection of Two Arrays II
    • 1160. Find Words That Can Be Formed by Characters
    • 2032. Two Out of Three
    • 981. Time Based Key-Value Store
    • 954. Array of Doubled Pairs
    • 2007. Find Original Array From Doubled Array
    • 811. Subdomain Visit Count
    • 833. Find And Replace in String
    • 1554. Strings Differ by One Character
    • 846. Hand of Straights, 1296. Divide Array in Sets of K Consecutive Numbers
    • 1512. Number of Good Pairs
    • 387. First Unique Character in a String
    • 1010. Pairs of Songs With Total Durations Divisible by 60
    • 1152. Analyze User Website Visit Pattern
    • 1657. Determine if Two Strings Are Close
    • 1347. Minimum Number of Steps to Make Two Strings Anagram
    • 2598. Smallest Missing Non-negative Integer After Operations
  • FB Study way
    • Facebook Tips
  • noname
  • Top K elements (heap, bucket sort)
    • 945. Minimum Increment to Make Array Unique
    • 347. Top K Frequent Elements
    • 692. Top K Frequent Words
    • 451. Sort Characters By Frequency
    • 502. IPO
    • 1046. Last Stone Weight
    • 1851. Minimum Interval to Include Each Query
  • bit
    • 2220. Minimum Bit Flips to Convert Number
    • 2419. Longest Subarray With Maximum Bitwise AND
    • 2917. Find the K-or of an Array
    • 717. 1-bit and 2-bit Characters
    • Xor ^
    • 1310. XOR Queries of a Subarray
    • 371. Sum of Two Integers
    • 2275. Largest Combination With Bitwise AND Greater Than Zero (&1, >>= 1 )
    • Bit Mask
    • 231. Power of Two
    • 191. Number of 1 Bits
    • 461. Hamming Distance
    • 477. Total Hamming Distance
    • Abbreviation
    • 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
    • 389. Find the Difference
  • String problem
    • 3. Longest Substring Without Repeating Characters
    • Perform String Shifts
    • 13. Roman to Integer
    • 14. Longest Common Prefix
    • 38. Count and Say
    • 68. Text Justification
    • 418 Sentence Screen Fitting
    • 151. Reverse Words in a String
    • 592. Fraction Addition and Subtraction
    • Page 1
    • 179. Largest Number
    • 468. Validate IP Address
    • 696. Count Binary Substrings
    • 937. Reorder Data in Log Files
    • 1592. Rearrange Spaces Between Words
    • 949. Largest Time for Given Digits
    • 2047. Number of Valid Words in a Sentence
    • 299. Bulls and Cows
    • 293. Flip Game
    • 1525. Number of Good Ways to Split a String
    • 551. Student Attendance Record I
  • array problem or interval
    • 163. Missing Ranges
    • 1441. Build an Array With Stack Operations
    • 12. Integer to Roman
    • 2373. Largest Local Values in a Matrix
    • 54. Spiral Matrix
    • 59. Spiral Matrix II
    • 2326. Spiral Matrix IV
    • 498. Diagonal Traverse
    • 56. Merge Intervals
    • 57. Insert Interval
    • 31. Next Permutation
    • 556. Next Greater Element III
    • 121. Best Time to Buy and Sell Stock
    • 217. Contains Duplicate
    • 219. Contains Duplicate II
    • 253. Meeting Rooms II
    • (similar to 253 )2406. Divide Intervals Into Minimum Number of Groups
    • lintcode - 1897 · Meeting Room III
    • 2402. Meeting Rooms III
    • 436. Find Right Interval
    • 1272. Remove Interval
    • 1288. Remove Covered Intervals
    • 729. My Calendar I
    • (sort by end)find Max Non-overlapping interval
    • 422. Valid Word Square
    • 900. RLE Iterator
    • sweep line
    • 2018. Check if Word Can Be Placed In Crossword
    • 2158. Amount of New Area Painted Each Day
    • 2345. Finding the Number of Visible Mountains
  • queue, dqueue
    • mono queue
  • stack
    • mono stack
    • 735. Asteroid Collision
    • 388. Longest Absolute File Path
  • Quick Sort, Quick Select, Kth smallest, Partition
    • tips
    • lintcode 31 · Partition Array (basic)
    • 75. Sort Colors
    • 215. Kth Largest Element in an Array
    • 347. Top K Frequent Elements
    • 973. K Closest Points to Origin
  • Heap
  • 1405. Longest Happy String
  • 1642. Furthest Building You Can Reach
  • Sort
  • Design
    • 1381. Design a Stack With Increment Operation
    • 146. LRU Cache
    • 295. Find Median from Data Stream
    • 355. Design Twitter
    • 460. LFU Cache
    • 588. Design In-Memory File System
    • 1429. First Unique Number
    • 380. Insert Delete GetRandom O(1)
    • 381. Insert Delete GetRandom O(1) - Duplicates allowed
    • 1146. Snapshot Array
    • 981. Time Based Key-Value Store
    • 359. Logger Rate Limiter
    • 2034. Stock Price Fluctuation
    • 362. Design Hit Counter
    • 348. Design Tic-Tac-Toe
    • 794. Valid Tic-Tac-Toe State
    • 1275. Find Winner on a Tic Tac Toe Game
    • 1628. Design an Expression Tree With Evaluate Function
  • Union Find
    • disjoint set - union find
    • 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
    • 2316. Count Unreachable Pairs of Nodes in an Undirected Graph
    • 261. Graph Valid Tree
    • 323. Number of Connected Components in an Undirected Graph
    • 547. Number of Provinces
    • 990. Satisfiability of Equality Equations
    • 737. Sentence Similarity II (use hashmap version)
    • 684. Redundant Connection
    • 947. Most Stones Removed with Same Row or Column
    • 1202. Smallest String With Swaps
  • Topology sort
    • 207. Course Schedule
    • 210. Course Schedule II
    • 1136. Parallel Courses
    • 2115. Find All Possible Recipes from Given Supplies
    • 269. Alien Dictionary
    • 310. Minimum Height Trees
    • 2285. Maximum Total Importance of Roads
  • merge sort realated
    • 315. Count of Smaller Numbers After Self
  • Path related
    • Dijkstra's Algo
    • 1102. Path With Maximum Minimum Value
  • Couting sort
    • 1122. Relative Sort Array
    • 825. Friends Of Appropriate Ages
  • Trie
    • 208. Implement Trie (Prefix Tree)
    • 211. Design Add and Search Words Data Structure
    • 212. Word Search II
    • 745. Prefix and Suffix Search
    • 1032. Stream of Characters
    • 1268. Search Suggestions System
  • Page 3
  • Math
    • 564. Find the Closest Palindrome
    • 775. Global and Local Inversions
    • 1360. Number of Days Between Two Dates
    • 7. Reverse Integer
    • 9. Palindrome Number
    • 66. Plus One
    • 67. Add Binary
    • 415. Add Strings
    • 2. Add Two Numbers
    • 989. Add to Array-Form of Integer
    • 263. Ugly Number
    • 836. Rectangle Overlap
    • 1025. Divisor Game
    • 202. Happy Number
    • 2033. Minimum Operations to Make a Uni-Value Grid
    • 2048. Next Greater Numerically Balanced Number
    • 843. Guess the Word
    • square
    • 384. Shuffle an Array
    • 149. Max Points on a Line
    • 2028. Find Missing Observations
    • 2128. Remove All Ones With Row and Column Flips
    • 539. Minimum Time Difference
    • 258. Add Digits
    • Page 5
    • 957. Prison Cells After N Days
    • 2178. Maximum Split of Positive Even Integers
    • 1492. The kth Factor of n
    • 273. Integer to English Words
  • Prefix Sum
    • 1608. Special Array With X Elements Greater Than or Equal X
    • (prefix product + siliding win)713. Subarray Product Less Than K
    • 930. Binary Subarrays With Sum
    • 2256. Minimum Average Difference
    • Page
    • 303. Range Sum Query - Immutable
    • 304. Range Sum Query 2D - Immutable
    • 560. Subarray Sum Equals K
    • lintcode 1844 · subarray sum equals to k II
    • 325. Maximum Size Subarray Sum Equals k (can refer to lintcode 1844)
    • 209. Minimum Size Subarray Sum
    • 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
    • 525. Contiguous Array
    • Diff array (差分
    • 1685. Sum of Absolute Differences in a Sorted Array
    • (sum %= k) 523. Continuous Subarray Sum
    • (sum %= k) 974. Subarray Sums Divisible by K
    • (sum % p) 1590. Make Sum Divisible by P
    • 2845. Count of Interesting Subarrays
    • 2155. All Divisions With the Highest Score of a Binary Array
    • 2875. Minimum Size Subarray in Infinite Array
  • Weekly Contest
    • Weekly Contest 274
    • Weekly Contest 275
    • Weekly Contest 276
    • Weekly Contest 279
    • Weekly Contest 339
    • Weekly Contest 340
    • 2614. Prime In Diagonal
    • 2615. Sum of Distances (same as 2121. Intervals Between Identical Elements)
    • 2616. Minimize the Maximum Difference of Pairs (binary search idea
    • TreeMap or TreeSet
    • 432. All O`one Data Structure
    • 2353. Design a Food Rating System
    • 2817. Minimum Absolute Difference Between Elements With Constraint
    • Pratical
    • 2437. Number of Valid Clock Times
    • 681. Next Closest Time
    • Min Max
    • 2905. Find Indices With Index and Value Difference II
    • 2910. Minimum Number of Groups to Create a Valid Assignment
    • Min or Max Prefix Suffix
    • 2012. Sum of Beauty in the Array
    • 2874. Maximum Value of an Ordered Triplet II
    • 2909. Minimum Sum of Mountain Triplets II
    • Greedy
    • 2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
    • 1921. Eliminate Maximum Number of Monsters
    • 2147. Number of Ways to Divide a Long Corridor
    • DFS
    • 814. Binary Tree Pruning
    • 2925. Maximum Score After Applying Operations on a Tree
    • (re-root) 834. Sum of Distances in Tree
    • Math, Geometry
    • 1266. Minimum Time Visiting All Points
    • 2849. Determine if a Cell Is Reachable at a Given Time
    • 1759. Count Number of Homogenous Substrings
    • 2 pointers
    • 1578. Minimum Time to Make Rope Colorful
    • 2332. The Latest Time to Catch a Bus
    • Brainteaser
    • 1503. Last Moment Before All Ants Fall Out of a Plank
    • 1535. Find the Winner of an Array Game
    • Good Qestions
    • 2948. Make Lexicographically Smallest Array by Swapping Elements
    • 1930. Unique Length-3 Palindromic Subsequences
    • 1980. Find Unique Binary String - Cantor's Diagonalization
    • 1727. Largest Submatrix With Rearrangements
    • Backtracking practice
    • 2664. The Knight’s Tour
    • Matrix
    • 1582. Special Positions in a Binary Matrix
    • 531. Lonely Pixel I
  • O(n) to find top2 min or max number
    • 1913. Maximum Product Difference Between Two Pairs
    • 2706. Buy Two Chocolates
    • Some interesting easy
    • Atlassian
    • Page 11
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  1. Quick Sort, Quick Select, Kth smallest, Partition

tips

see my tips:

https://wool-lamprey-b10.notion.site/Quick-Sort-Quickselect-a82d6373689649b0b9cebc80ae79e4fe

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