SUMMARY.md

Table of contents

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Easy

• 100. Same Tree
• 101. Symmetric Tree
• 136. Single Number
• 145. Binary Tree Postorder Traversal
• 155. Min Stack
  • hashmap
• 219. Contains Duplicate II
  • hashmap
  • slidingwindow
• 222. Count Complete Tree Nodes
• 350. Intersection of Two Arrays II
• 495. Teemo Attacking
• 590. N ary Tree Postorder Traversal
• 594. Longest Harmonious Subsequence
• 628. Maximum Product of Three Numbers
• 860. Lemonade Change
• 884. Uncommon Words from Two Sentences
• 1021. Remove Outermost Parentheses
• 1189. Maximum Number of Balloons
• 1260. Shift 2D Grid
• 1331. Rank Transform of an Array
• 1399. Count Largest Group
• 1455. Check If A Word Occurs As A Prefix Of Any Word In A Sentence
• 1475. Final Prices With A Special Discount In A Shop
• 1486. XOR Operation in an Array
• 1518. Water Bottles
• 1539. Kth Missing Positive Number
• 1550. Three Consecutive Odds
• 1598. Crawler Log Folder
  • cpp
• 1636. Sort Array By Increasing Frequency
• 1684. Count The Number Of Consistent Strings
• 1945. Sum of Digits of String After Convert
• 1967. Number of Strings That Appear as Substrings in Word
• 1979. Find Greatest Common Divisor of Array
• 2022. Convert 1D Array Into 2D Array
• 2053. Kth Distinct String in an Array
• 2191. Sort the Jumbled Numbers
• 2418. Sort the People
• 2558. Take Gifts From The Richest Pile
• 2582. Passing The Pillow
  • rust
• 2696. Minimum String Length After Removing Substrings
• 3216. Lexicographically Smallest String After a Swap
• 3314. Construct the Minimum Bitwise Array I
• 3375. Minimum Operations to Make Array Values Equal to k
• 3536. Maximum Product of Two Digits
• 3637. Trionic Array I
• 3658. GCD of Odd and Even Sums
• 3754. Concatenate Non Zero Digits and Multiply by Sum I

Medium

• 33. Search in rotated sorted array
• 40. Combination Sum II
• 63. Unique Paths II
• 81. Search In Rotated Sorted Array
• 122-Best-Time-to-Buy-and-Sell-Stock-II. 122 Best Time to Buy and Sell Stock II
• 128. Longest Consecutive Sequence
• 155. Min Stack
• 179. Largest number
• 208. Implement trie (prefix tree)
• 209. Minimum Size Subarray Sum
• 238. Product of Array Except Self
• 241. Different Ways to Add Parentheses
• 264. Ugly Number II
• 300. Longest Increasing Subsequence
  • bottomup
  • greedy-patience-sort
  • topdown
• 307. Range sum query Mutable
• 539. Minimum Time Difference
• 567. Permutation in String
• 624. Maximum Distance in Arrays
• 654. Maximum Binary Tree
• 725. Split Linked List in Parts
• 729. My Calendar I
• 739. Daily Temperatures
• 763. Partition Labels
• 790. Domino and Tromino Tiling
• 807. Max Increase to Keep City Skyline
• 826. Most Profit Assigning Work
• 840. Magic Squares In Grid
• 853. Car Fleet
• 874. Walking Robot Simulation
• 875. KoKo Eating Bananas
• 885. Spiral Matrix III
• 921. Minimum Add To Make Parentheses Valid
• 947. Most Stones Removed with Same Row or Column
• 959. Regions Cut By Slashes
• 981. Time Based Key Value Store
• 1014. Best Sightseeing Pair
• 1038. Binary Search Tree to Greater Sum Tree
• 1052. Grumpy Bookstore Owner
• 1081. Smallest Subsequence of Distinct Characters
• 1110. Delete Nodes And Return Forest
• 1140. Stone Game II
• 1190. Reverse Substrings Between Each Pair Of Parentheses
• 1261. Find Elements in a Contaminated Binary Tree
• 1288. Remove Covered Intervals
• 1291. Sequential Digits
• 1310. XOR Queries of a Subarray
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1382. Balance A Binary Search Tree
• 1395. Count Number of Teams
• 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• 1482. Minimum number of days to make m bouquets
• 1497. Check If Array Pairs Are Divisible by k
• 1530. Number of Good Leaf Nodes Pairs
• 1552. Magnetic Force Between Two Balls
• 1593. Split a String Into the Max Number of Unique Substrings
• 1605. Find Valid Matrix Given Row and Column Sums
• 1653. Minimum Deletions to Make String Balanced
• 1701. Average Waiting Time
• 1717. Maximum Score From Removing Substrings
• 1760. Minimum Limit Of Balls In A Bag
• 1823. Find The Winner Of The Circular Game
• 1833. Maximum Ice Cream Bars
• 1846. Maximum Element After Decreasing and Rearranging
• 1894. Find the Student that Will Replace the Chalk
• 1905. Count Sub Islands
  • cpp
  • go
  • java
• 1922. Count Good Numbers
• 1942. The Number of the Smallest Unoccupied Chair
• 1963. Minimum Number of Swaps to Make the String Balanced
• 1975. Maxium Matrix Sum
• 2028. Find Missing Observations
• 2058. Find the Minimum and Maximum Number of Nodes Between Critical Points
• 2070. Most Beautiful Item for Each Query
• 2096. Step By Step Directions From A Binary Tree Node To Another
  • go
• 2109. Adding Spaces To A String
• 2161. Partition Array According to Given Pivot
• 2181. Merge Nodes in Between Zeros
• 2182. Construct string with repeat limit
• 2192. All Ancestor of a Node in a Directed Acyclic Graph
• 2196. Create Binary Tree From Descriptions
  • cpp
  • go
  • java
  • rust
• 2226. Maximum candies allocate to K children
• 2270. Number Of Ways To Split Array
• 2285. Maximum Total Importance of Roads
• 2326. Spiral Matrix IV
• 2337. Move Pieces to Obtain a String
• 2419. Longest Subarray With Maximum Bitwise AND
• 2461. Maximum Sum of Distinct Subarrays With Length K
• 2491. Divide Players Into Teams of Equal Skill
• 2492. Minimum Score of a Path Between Two Cities
• 2501. Longest Square Streak in an Array
• 2583. Kth Largest Sum in a Binary Tree
• 2601. Prime Subtraction Operation
• 2685. Count the Number of Complete Components
• 2707. Extra Characters In A String
• 2779. Maximum Beauty Of An Array After Applying Operation
• 2825. Make String a Subsequence Using Cyclic Increments
• 2924. Find Champion II
• 3016. Minimum Number of Pushes to Type Word II
• 3020. Find the Maximum Number of Elements in Subset
• 3043. Find the Length of the Longest Common Prefix
• 3097. Shortest Subarray With OR at Least K II
• 3217. Delete Nodes From Linked List Present in Array
• 3218. Minimum Cost for Cutting Cake I
• 3254. Find the Power of K Size Subarrays I
• 3286. Find a Safe Walk Through a Grid
• 3499. Maximize Active Section with Trade I
• 3513. Number of Unique XOR Triplets I
• 3514. Number of Unique XOR Triplets II
• 3532. Path Existence Queries in a Graph I
• 3756. Concatenate Non Zero Digits and Multiply by Sum II
• 3867. Sum of GCD of Formed Pairs

Hard

• 11. Container With Most Water
• 23. Merge k Sorted Lists
• 37. Sudoku Solver
• 41. First Missing Positive
• 188. Best Time to Buy and Sell Stock IV
• 212. Word Search II
• 214. Shortest Palindrome
• 239. Sliding Window Maximum
• 295. Find Median from Data Stream
• 502. IPO
• 664. Strange Printer
• 719. Find K th Smallest Pair Distance
• 726. Number of Atoms
• 773. Sliding Puzzle
• 862. Shortest Subarray with Sum at Least K
• 995. Minimum Number of K Consecutive Bit Flips
• 1106. Parsing A Boolean Expression
• 1301. Number of Paths with Max Score
• 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
• 2071. Maximum Number of Tasks You Can Assign
• 2302. Count Subarrays With Score Less Than K
• 2392. Build a Matrix With Conditions
• 2416. Sum of Prefix Scores of Strings
• 2503. Maximum Number of Points From Grid Queries
• 2551. Put Marbles in Bags
• 2751. Robot Collisions
• 3219. Minimum Cost for Cutting Cake II
• 3336. Find the Number of Subsequences With Equal GCD
• 3363. Find the Maximum Number of Fruits Collected
• 3534. Path Existence Queries in a Graph II
• 3620. Network Recovery Pathways
• 3739. Count Subarrays With Majority Element II