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Binary Search

• 3508. Implement Router
• 3501. Maximize Active Section with Trade II
• 3488. Closest Equal Element Queries
• 3479. Fruits Into Baskets III
• 3477. Fruits Into Baskets II
• 3464. Maximize the Distance Between Points on a Square
• 3455. Shortest Matching Substring
• 3454. Separate Squares II
• 3453. Separate Squares I
• 3449. Maximize the Minimum Game Score
• 3419. Minimize the Maximum Edge Weight of Graph
• 3414. Maximum Score of Non-overlapping Intervals
• 3413. Maximum Coins From K Consecutive Bags
• 3399. Smallest Substring With Identical Characters II
• 3398. Smallest Substring With Identical Characters I
• 3369. Design an Array Statistics Tracker
• 3357. Minimize the Maximum Adjacent Element Difference
• 3356. Zero Array Transformation II
• 3350. Adjacent Increasing Subarrays Detection II
• 3347. Maximum Frequency of an Element After Performing Operations II
• 3346. Maximum Frequency of an Element After Performing Operations I
• 3344. Maximum Sized Array
• 3323. Minimize Connected Groups by Inserting Interval
• 3312. Sorted GCD Pair Queries
• 3296. Minimum Number of Seconds to Make Mountain Height Zero
• 3292. Minimum Number of Valid Strings to Form Target II
• 3291. Minimum Number of Valid Strings to Form Target I
• 3288. Length of the Longest Increasing Path
• 3281. Maximize Score of Numbers in Ranges
• 3261. Count Substrings That Satisfy K-Constraint II
• 3231. Minimum Number of Increasing Subsequence to Be Removed
• 3209. Number of Subarrays With AND Value of K
• 3186. Maximum Total Damage With Spell Casting
• 3171. Find Subarray With Bitwise OR Closest to K
• 3161. Block Placement Queries
• 3155. Maximum Number of Upgradable Servers
• 3152. Special Array II
• 3145. Find Products of Elements of Big Array
• 3143. Maximum Points Inside the Square
• 3135. Equalize Strings by Adding or Removing Characters at Ends
• 3134. Find the Median of the Uniqueness Array
• 3117. Minimum Sum of Values by Dividing Array
• 3116. Kth Smallest Amount With Single Denomination Combination
• 3113. Find the Number of Subarrays Where Boundary Elements Are Maximum
• 3109. Find the Index of Permutation
• 3104. Find Longest Self-Contained Substring
• 3049. Earliest Second to Mark Indices II
• 3048. Earliest Second to Mark Indices I
• 3008. Find Beautiful Indices in the Given Array II
• 3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K
• 3006. Find Beautiful Indices in the Given Array I
• 2982. Find Longest Special Substring That Occurs Thrice II
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2972. Count the Number of Incremovable Subarrays II
• 2970. Count the Number of Incremovable Subarrays I
• 2968. Apply Operations to Maximize Frequency Score
• 2967. Minimum Cost to Make Array Equalindromic
• 2945. Find Maximum Non-decreasing Array Length
• 2941. Maximum GCD-Sum of a Subarray
• 2940. Find Building Where Alice and Bob Can Meet
• 2936. Number of Equal Numbers Blocks
• 2926. Maximum Balanced Subsequence Sum
• 2861. Maximum Number of Alloys
• 2856. Minimum Array Length After Pair Removals
• 2838. Maximum Coins Heroes Can Collect
• 2831. Find the Longest Equal Subarray
• 2830. Maximize the Profit as the Salesman
• 2826. Sorting Three Groups
• 2824. Count Pairs Whose Sum is Less than Target
• 2819. Minimum Relative Loss After Buying Chocolates
• 2817. Minimum Absolute Difference Between Elements With Constraint
• 2812. Find the Safest Path in a Grid
• 2790. Maximum Number of Groups With Increasing Length
• 2779. Maximum Beauty of an Array After Applying Operation
• 2736. Maximum Sum Queries
• 2713. Maximum Strictly Increasing Cells in a Matrix
• 2702. Minimum Operations to Make Numbers Non-positive
• 2659. Make Array Empty
• 2616. Minimize the Maximum Difference of Pairs
• 2604. Minimum Time to Eat All Grains
• 2602. Minimum Operations to Make All Array Elements Equal
• 2601. Prime Subtraction Operation
• 2594. Minimum Time to Repair Cars
• 2589. Minimum Time to Complete All Tasks
• 2576. Find the Maximum Number of Marked Indices
• 2565. Subsequence With the Minimum Score
• 2563. Count the Number of Fair Pairs
• 2560. House Robber IV
• 2557. Maximum Number of Integers to Choose From a Range II
• 2555. Maximize Win From Two Segments
• 2554. Maximum Number of Integers to Choose From a Range I
• 2540. Minimum Common Value
• 2529. Maximum Count of Positive Integer and Negative Integer
• 2528. Maximize the Minimum Powered City
• 2519. Count the Number of K-Big Indices
• 2517. Maximum Tastiness of Candy Basket
• 2513. Minimize the Maximum of Two Arrays
• 2501. Longest Square Streak in an Array
• 2498. Frog Jump II
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2468. Split Message Based on Limit
• 2454. Next Greater Element IV
• 2448. Minimum Cost to Make Array Equal
• 2439. Minimize Maximum of Array
• 2426. Number of Pairs Satisfying Inequality
• 2424. Longest Uploaded Prefix
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2398. Maximum Number of Robots Within Budget
• 2389. Longest Subsequence With Limited Sum
• 2387. Median of a Row Wise Sorted Matrix
• 2358. Maximum Number of Groups Entering a Competition
• 2354. Number of Excellent Pairs
• 2333. Minimum Sum of Squared Difference
• 2332. The Latest Time to Catch a Bus
• 2302. Count Subarrays With Score Less Than K
• 2300. Successful Pairs of Spells and Potions
• 2286. Booking Concert Tickets in Groups
• 2271. Maximum White Tiles Covered by a Carpet
• 2258. Escape the Spreading Fire
• 2251. Number of Flowers in Full Bloom
• 2250. Count Number of Rectangles Containing Each Point
• 2234. Maximum Total Beauty of the Gardens
• 2226. Maximum Candies Allocated to K Children
• 2223. Sum of Scores of Built Strings
• 2187. Minimum Time to Complete Trips
• 2179. Count Good Triplets in an Array
• 2141. Maximum Running Time of N Computers
• 2137. Pour Water Between Buckets to Make Water Levels Equal
• 2111. Minimum Operations to Make the Array K-Increasing
• 2106. Maximum Fruits Harvested After at Most K Steps
• 2089. Find Target Indices After Sorting Array
• 2080. Range Frequency Queries
• 2071. Maximum Number of Tasks You Can Assign
• 2070. Most Beautiful Item for Each Query
• 2064. Minimized Maximum of Products Distributed to Any Store
• 2055. Plates Between Candles
• 2054. Two Best Non-Overlapping Events
• 2040. Kth Smallest Product of Two Sorted Arrays
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2031. Count Subarrays With More Ones Than Zeros
• 2024. Maximize the Confusion of an Exam
• 2009. Minimum Number of Operations to Make Array Continuous
• 2008. Maximum Earnings From Taxi
• 1970. Last Day Where You Can Still Cross
• 1966. Binary Searchable Numbers in an Unsorted Array
• 1964. Find the Longest Valid Obstacle Course at Each Position
• 1956. Minimum Time For K Virus Variants to Spread
• 1954. Minimum Garden Perimeter to Collect Enough Apples
• 1932. Merge BSTs to Create Single BST
• 1923. Longest Common Subpath
• 1918. Kth Smallest Subarray Sum
• 1901. Find a Peak Element II
• 1898. Maximum Number of Removable Characters
• 1894. Find the Student that Will Replace the Chalk
• 1891. Cutting Ribbons
• 1889. Minimum Space Wasted From Packaging
• 1885. Count Pairs in Two Arrays
• 1870. Minimum Speed to Arrive on Time
• 1862. Sum of Floored Pairs
• 1855. Maximum Distance Between a Pair of Values
• 1851. Minimum Interval to Include Each Query
• 1847. Closest Room
• 1838. Frequency of the Most Frequent Element
• 1818. Minimum Absolute Sum Difference
• 1802. Maximum Value at a Given Index in a Bounded Array
• 1793. Maximum Score of a Good Subarray
• 1782. Count Pairs Of Nodes
• 1760. Minimum Limit of Balls in a Bag
• 1751. Maximum Number of Events That Can Be Attended II
• 1739. Building Boxes
• 1713. Minimum Operations to Make a Subsequence
• 1712. Ways to Split Array Into Three Subarrays
• 1671. Minimum Number of Removals to Make Mountain Array
• 1658. Minimum Operations to Reduce X to Zero
• 1649. Create Sorted Array through Instructions
• 1648. Sell Diminishing-Valued Colored Balls
• 1631. Path With Minimum Effort
• 1618. Maximum Font to Fit a Sentence in a Screen
• 1608. Special Array With X Elements Greater Than or Equal X
• 1574. Shortest Subarray to be Removed to Make Array Sorted
• 1562. Find Latest Group of Size M
• 1552. Magnetic Force Between Two Balls
• 1539. Kth Missing Positive Number
• 1533. Find the Index of the Large Integer
• 1521. Find a Value of a Mysterious Function Closest to Target
• 1508. Range Sum of Sorted Subarray Sums
• 1498. Number of Subsequences That Satisfy the Given Sum Condition
• 1488. Avoid Flood in The City
• 1483. Kth Ancestor of a Tree Node
• 1482. Minimum Number of Days to Make m Bouquets
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
• 1428. Leftmost Column with at Least a One
• 1385. Find the Distance Value Between Two Arrays
• 1351. Count Negative Numbers in a Sorted Matrix
• 1348. Tweet Counts Per Frequency
• 1346. Check If N and Its Double Exist
• 1337. The K Weakest Rows in a Matrix
• 1300. Sum of Mutated Array Closest to Target
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1283. Find the Smallest Divisor Given a Threshold
• 1268. Search Suggestions System
• 1237. Find Positive Integer Solution for a Given Equation
• 1235. Maximum Profit in Job Scheduling
• 1231. Divide Chocolate
• 1214. Two Sum BSTs
• 1213. Intersection of Three Sorted Arrays
• 1208. Get Equal Substrings Within Budget
• 1201. Ugly Number III
• 1198. Find Smallest Common Element in All Rows
• 1187. Make Array Strictly Increasing
• 1182. Shortest Distance to Target Color
• 1170. Compare Strings by Frequency of the Smallest Character
• 1157. Online Majority Element In Subarray
• 1150. Check If a Number Is Majority Element in a Sorted Array
• 1146. Snapshot Array
• 1102. Path With Maximum Minimum Value
• 1099. Two Sum Less Than K
• 1095. Find in Mountain Array
• 1064. Fixed Point
• 1062. Longest Repeating Substring
• 1060. Missing Element in Sorted Array
• 1055. Shortest Way to Form String
• 1044. Longest Duplicate Substring
• 1027. Longest Arithmetic Subsequence
• 1011. Capacity To Ship Packages Within D Days
• 1004. Max Consecutive Ones III
• 981. Time Based Key-Value Store
• 911. Online Election
• 902. Numbers At Most N Given Digit Set
• 888. Fair Candy Swap
• 887. Super Egg Drop
• 878. Nth Magical Number
• 875. Koko Eating Bananas
• 862. Shortest Subarray with Sum at Least K
• 852. Peak Index in a Mountain Array
• 826. Most Profit Assigning Work
• 825. Friends Of Appropriate Ages
• 793. Preimage Size of Factorial Zeroes Function
• 792. Number of Matching Subsequences
• 786. K-th Smallest Prime Fraction
• 778. Swim in Rising Water
• 774. Minimize Max Distance to Gas Station
• 754. Reach a Number
• 744. Find Smallest Letter Greater Than Target
• 732. My Calendar III
• 731. My Calendar II
• 729. My Calendar I
• 719. Find K-th Smallest Pair Distance
• 718. Maximum Length of Repeated Subarray
• 713. Subarray Product Less Than K
• 710. Random Pick with Blacklist
• 704. Binary Search
• 702. Search in a Sorted Array of Unknown Size
• 668. Kth Smallest Number in Multiplication Table
• 658. Find K Closest Elements
• 644. Maximum Average Subarray II
• 633. Sum of Square Numbers
• 611. Valid Triangle Number
• 540. Single Element in a Sorted Array
• 532. K-diff Pairs in an Array
• 497. Random Point in Non-overlapping Rectangles
• 493. Reverse Pairs
• 483. Smallest Good Base
• 475. Heaters
• 456. 132 Pattern
• 441. Arranging Coins
• 436. Find Right Interval
• 410. Split Array Largest Sum
• 400. Nth Digit
• 378. Kth Smallest Element in a Sorted Matrix
• 374. Guess Number Higher or Lower
• 367. Valid Perfect Square
• 363. Max Sum of Rectangle No Larger Than K
• 362. Design Hit Counter
• 354. Russian Doll Envelopes
• 352. Data Stream as Disjoint Intervals
• 350. Intersection of Two Arrays II
• 349. Intersection of Two Arrays
• 327. Count of Range Sum
• 315. Count of Smaller Numbers After Self
• 302. Smallest Rectangle Enclosing Black Pixels
• 300. Longest Increasing Subsequence
• 287. Find the Duplicate Number
• 278. First Bad Version
• 275. H-Index II
• 270. Closest Binary Search Tree Value
• 268. Missing Number
• 259. 3Sum Smaller
• 240. Search a 2D Matrix II
• 222. Count Complete Tree Nodes
• 209. Minimum Size Subarray Sum
• 167. Two Sum II - Input Array Is Sorted
• 162. Find Peak Element
• 154. Find Minimum in Rotated Sorted Array II
• 153. Find Minimum in Rotated Sorted Array
• 81. Search in Rotated Sorted Array II
• 74. Search a 2D Matrix
• 69. Sqrt(x)
• 35. Search Insert Position
• 34. Find First and Last Position of Element in Sorted Array
• 33. Search in Rotated Sorted Array
• 4. Median of Two Sorted Arrays

Breadth-First Search

• 3493. Properties Graph
• 3481. Apply Substitutions
• 3419. Minimize the Maximum Edge Weight of Graph
• 3387. Maximize Amount After Two Days of Conversions
• 3383. Minimum Runes to Add to Cast Spell
• 3373. Maximize the Number of Target Nodes After Connecting Trees II
• 3372. Maximize the Number of Target Nodes After Connecting Trees I
• 3310. Remove Methods From Project
• 3286. Find a Safe Walk Through a Grid
• 3283. Maximum Number of Moves to Kill All Pawns
• 3243. Shortest Distance After Road Addition Queries I
• 3235. Check if the Rectangle Corner Is Reachable
• 3203. Find Minimum Diameter After Merging Two Trees
• 3157. Find the Level of Tree with Minimum Sum
• 3141. Maximum Hamming Distances
• 3123. Find Edges in Shortest Paths
• 3015. Count the Number of Houses at a Certain Distance I
• 2998. Minimum Number of Operations to Make X and Y Equal
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 2852. Sum of Remoteness of All Cells
• 2850. Minimum Moves to Spread Stones Over Grid
• 2814. Minimum Time Takes to Reach Destination Without Drowning
• 2812. Find the Safest Path in a Grid
• 2773. Height of Special Binary Tree
• 2685. Count the Number of Complete Components
• 2658. Maximum Number of Fish in a Grid
• 2641. Cousins in Binary Tree II
• 2617. Minimum Number of Visited Cells in a Grid
• 2612. Minimum Reverse Operations
• 2608. Shortest Cycle in a Graph
• 2596. Check Knight Tour Configuration
• 2583. Kth Largest Sum in a Binary Tree
• 2577. Minimum Time to Visit a Cell In a Grid
• 2556. Disconnect Path in a Binary Matrix by at Most One Flip
• 2503. Maximum Number of Points From Grid Queries
• 2493. Divide Nodes Into the Maximum Number of Groups
• 2492. Minimum Score of a Path Between Two Cities
• 2477. Minimum Fuel Cost to Report to the Capital
• 2471. Minimum Number of Operations to Sort a Binary Tree by Level
• 2467. Most Profitable Path in a Tree
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2445. Number of Nodes With Value One
• 2415. Reverse Odd Levels of Binary Tree
• 2385. Amount of Time for Binary Tree to Be Infected
• 2368. Reachable Nodes With Restrictions
• 2360. Longest Cycle in a Graph
• 2328. Number of Increasing Paths in a Grid
• 2316. Count Unreachable Pairs of Nodes in an Undirected Graph
• 2290. Minimum Obstacle Removal to Reach Corner
• 2277. Closest Node to Path in Tree
• 2258. Escape the Spreading Fire
• 2204. Distance to a Cycle in Undirected Graph
• 2192. All Ancestors of a Node in a Directed Acyclic Graph
• 2174. Remove All Ones With Row and Column Flips II
• 2146. K Highest Ranked Items Within a Price Range
• 2101. Detonate the Maximum Bombs
• 2092. Find All People With Secret
• 2059. Minimum Operations to Convert Number
• 2045. Second Minimum Time to Reach Destination
• 2039. The Time When the Network Becomes Idle
• 1993. Operations on Tree
• 1992. Find All Groups of Farmland
• 1971. Find if Path Exists in Graph
• 1970. Last Day Where You Can Still Cross
• 1926. Nearest Exit from Entrance in Maze
• 1905. Count Sub Islands
• 1810. Minimum Path Cost in a Hidden Grid
• 1778. Shortest Path in a Hidden Grid
• 1765. Map of Highest Peak
• 1740. Find Distance in a Binary Tree
• 1730. Shortest Path to Get Food
• 1660. Correct a Binary Tree
• 1654. Minimum Jumps to Reach Home
• 1631. Path With Minimum Effort
• 1625. Lexicographically Smallest String After Applying Operations
• 1609. Even Odd Tree
• 1602. Find Nearest Right Node in Binary Tree
• 1568. Minimum Number of Days to Disconnect Island
• 1559. Detect Cycles in 2D Grid
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1490. Clone N-ary Tree
• 1485. Clone Binary Tree With Random Pointer
• 1483. Kth Ancestor of a Tree Node
• 1469. Find All The Lonely Nodes
• 1466. Reorder Routes to Make All Paths Lead to the City Zero
• 1462. Course Schedule IV
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1448. Count Good Nodes in Binary Tree
• 1443. Minimum Time to Collect All Apples in a Tree
• 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree
• 1391. Check if There is a Valid Path in a Grid
• 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
• 1377. Frog Position After T Seconds
• 1376. Time Needed to Inform All Employees
• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 1361. Validate Binary Tree Nodes
• 1345. Jump Game IV
• 1319. Number of Operations to Make Network Connected
• 1315. Sum of Nodes with Even-Valued Grandparent
• 1311. Get Watched Videos by Your Friends
• 1306. Jump Game III
• 1302. Deepest Leaves Sum
• 1298. Maximum Candies You Can Get from Boxes
• 1293. Shortest Path in a Grid with Obstacles Elimination
• 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
• 1273. Delete Tree Nodes
• 1267. Count Servers that Communicate
• 1263. Minimum Moves to Move a Box to Their Target Location
• 1261. Find Elements in a Contaminated Binary Tree
• 1257. Smallest Common Region
• 1254. Number of Closed Islands
• 1245. Tree Diameter
• 1242. Web Crawler Multithreaded
• 1236. Web Crawler
• 1215. Stepping Numbers
• 1210. Minimum Moves to Reach Target with Rotations
• 1203. Sort Items by Groups Respecting Dependencies
• 1202. Smallest String With Swaps
• 1197. Minimum Knight Moves
• 1162. As Far from Land as Possible
• 1161. Maximum Level Sum of a Binary Tree
• 1129. Shortest Path with Alternating Colors
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1102. Path With Maximum Minimum Value
• 1096. Brace Expansion II
• 1091. Shortest Path in Binary Matrix
• 1087. Brace Expansion
• 1042. Flower Planting With No Adjacent
• 1036. Escape a Large Maze
• 1034. Coloring A Border
• 1020. Number of Enclaves
• 994. Rotting Oranges
• 993. Cousins in Binary Tree
• 987. Vertical Order Traversal of a Binary Tree
• 967. Numbers With Same Consecutive Differences
• 965. Univalued Binary Tree
• 959. Regions Cut By Slashes
• 958. Check Completeness of a Binary Tree
• 934. Shortest Bridge
• 928. Minimize Malware Spread II
• 924. Minimize Malware Spread
• 919. Complete Binary Tree Inserter
• 909. Snakes and Ladders
• 886. Possible Bipartition
• 865. Smallest Subtree with all the Deepest Nodes
• 864. Shortest Path to Get All Keys
• 863. All Nodes Distance K in Binary Tree
• 854. K-Similar Strings
• 847. Shortest Path Visiting All Nodes
• 841. Keys and Rooms
• 839. Similar String Groups
• 827. Making A Large Island
• 815. Bus Routes
• 802. Find Eventual Safe States
• 797. All Paths From Source to Target
• 787. Cheapest Flights Within K Stops
• 785. Is Graph Bipartite?
• 783. Minimum Distance Between BST Nodes
• 778. Swim in Rising Water
• 773. Sliding Puzzle
• 765. Couples Holding Hands
• 756. Pyramid Transition Matrix
• 752. Open the Lock
• 749. Contain Virus
• 743. Network Delay Time
• 742. Closest Leaf in a Binary Tree
• 737. Sentence Similarity II
• 733. Flood Fill
• 721. Accounts Merge
• 711. Number of Distinct Islands II
• 695. Max Area of Island
• 694. Number of Distinct Islands
• 690. Employee Importance
• 685. Redundant Connection II
• 684. Redundant Connection
• 675. Cut Off Trees for Golf Event
• 672. Bulb Switcher II
• 662. Maximum Width of Binary Tree
• 655. Print Binary Tree
• 653. Two Sum IV - Input is a BST
• 637. Average of Levels in Binary Tree
• 623. Add One Row to Tree
• 617. Merge Two Binary Trees
• 582. Kill Process
• 559. Maximum Depth of N-ary Tree
• 547. Number of Provinces
• 542. 01 Matrix
• 530. Minimum Absolute Difference in BST
• 529. Minesweeper
• 515. Find Largest Value in Each Tree Row
• 514. Freedom Trail
• 513. Find Bottom Left Tree Value
• 505. The Maze II
• 499. The Maze III
• 490. The Maze
• 488. Zuma Game
• 463. Island Perimeter
• 449. Serialize and Deserialize BST
• 433. Minimum Genetic Mutation
• 431. Encode N-ary Tree to Binary Tree
• 429. N-ary Tree Level Order Traversal
• 428. Serialize and Deserialize N-ary Tree
• 417. Pacific Atlantic Water Flow
• 407. Trapping Rain Water II
• 404. Sum of Left Leaves
• 399. Evaluate Division
• 365. Water and Jug Problem
• 364. Nested List Weight Sum II
• 339. Nested List Weight Sum
• 329. Longest Increasing Path in a Matrix
• 323. Number of Connected Components in an Undirected Graph
• 322. Coin Change
• 317. Shortest Distance from All Buildings
• 314. Binary Tree Vertical Order Traversal
• 310. Minimum Height Trees
• 302. Smallest Rectangle Enclosing Black Pixels
• 301. Remove Invalid Parentheses
• 297. Serialize and Deserialize Binary Tree
• 286. Walls and Gates
• 279. Perfect Squares
• 269. Alien Dictionary
• 261. Graph Valid Tree
• 226. Invert Binary Tree
• 210. Course Schedule II
• 207. Course Schedule
• 200. Number of Islands
• 199. Binary Tree Right Side View
• 133. Clone Graph
• 130. Surrounded Regions
• 127. Word Ladder
• 126. Word Ladder II
• 117. Populating Next Right Pointers in Each Node II
• 116. Populating Next Right Pointers in Each Node
• 112. Path Sum
• 111. Minimum Depth of Binary Tree
• 107. Binary Tree Level Order Traversal II
• 104. Maximum Depth of Binary Tree
• 103. Binary Tree Zigzag Level Order Traversal
• 102. Binary Tree Level Order Traversal
• 101. Symmetric Tree
• 100. Same Tree

Depth-First Search

• 3515. Shortest Path in a Weighted Tree
• 3493. Properties Graph
• 3486. Longest Special Path II
• 3481. Apply Substitutions
• 3425. Longest Special Path
• 3419. Minimize the Maximum Edge Weight of Graph
• 3387. Maximize Amount After Two Days of Conversions
• 3385. Minimum Time to Break Locks II
• 3383. Minimum Runes to Add to Cast Spell
• 3376. Minimum Time to Break Locks I
• 3373. Maximize the Number of Target Nodes After Connecting Trees II
• 3372. Maximize the Number of Target Nodes After Connecting Trees I
• 3367. Maximize Sum of Weights after Edge Removals
• 3331. Find Subtree Sizes After Changes
• 3327. Check if DFS Strings Are Palindromes
• 3319. K-th Largest Perfect Subtree Size in Binary Tree
• 3313. Find the Last Marked Nodes in Tree
• 3310. Remove Methods From Project
• 3249. Count the Number of Good Nodes
• 3241. Time Taken to Mark All Nodes
• 3235. Check if the Rectangle Corner Is Reachable
• 3203. Find Minimum Diameter After Merging Two Trees
• 3157. Find the Level of Tree with Minimum Sum
• 3123. Find Edges in Shortest Paths
• 3067. Count Pairs of Connectable Servers in a Weighted Tree Network
• 3004. Maximum Subtree of the Same Color
• 2973. Find Number of Coins to Place in Tree Nodes
• 2925. Maximum Score After Applying Operations on a Tree
• 2920. Maximum Points After Collecting Coins From All Nodes
• 2872. Maximum Number of K-Divisible Components
• 2867. Count Valid Paths in a Tree
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 2852. Sum of Remoteness of All Cells
• 2792. Count Nodes That Are Great Enough
• 2791. Count Paths That Can Form a Palindrome in a Tree
• 2773. Height of Special Binary Tree
• 2764. Is Array a Preorder of Some ‌Binary Tree
• 2689. Extract Kth Character From The Rope Tree
• 2685. Count the Number of Complete Components
• 2658. Maximum Number of Fish in a Grid
• 2646. Minimize the Total Price of the Trips
• 2641. Cousins in Binary Tree II
• 2596. Check Knight Tour Configuration
• 2581. Count Number of Possible Root Nodes
• 2556. Disconnect Path in a Binary Matrix by at Most One Flip
• 2538. Difference Between Maximum and Minimum Price Sum
• 2493. Divide Nodes Into the Maximum Number of Groups
• 2492. Minimum Score of a Path Between Two Cities
• 2479. Maximum XOR of Two Non-Overlapping Subtrees
• 2477. Minimum Fuel Cost to Report to the Capital
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2467. Most Profitable Path in a Tree
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2445. Number of Nodes With Value One
• 2440. Create Components With Same Value
• 2415. Reverse Odd Levels of Binary Tree
• 2385. Amount of Time for Binary Tree to Be Infected
• 2378. Choose Edges to Maximize Score in a Tree
• 2368. Reachable Nodes With Restrictions
• 2360. Longest Cycle in a Graph
• 2359. Find Closest Node to Given Two Nodes
• 2331. Evaluate Boolean Binary Tree
• 2328. Number of Increasing Paths in a Grid
• 2322. Minimum Score After Removals on a Tree
• 2316. Count Unreachable Pairs of Nodes in an Undirected Graph
• 2313. Minimum Flips in Binary Tree to Get Result
• 2307. Check for Contradictions in Equations
• 2277. Closest Node to Path in Tree
• 2265. Count Nodes Equal to Average of Subtree
• 2246. Longest Path With Different Adjacent Characters
• 2204. Distance to a Cycle in Undirected Graph
• 2192. All Ancestors of a Node in a Directed Acyclic Graph
• 2127. Maximum Employees to Be Invited to a Meeting
• 2101. Detonate the Maximum Bombs
• 2097. Valid Arrangement of Pairs
• 2096. Step-By-Step Directions From a Binary Tree Node to Another
• 2092. Find All People With Secret
• 2049. Count Nodes With the Highest Score
• 2003. Smallest Missing Genetic Value in Each Subtree
• 1993. Operations on Tree
• 1992. Find All Groups of Farmland
• 1973. Count Nodes Equal to Sum of Descendants
• 1971. Find if Path Exists in Graph
• 1970. Last Day Where You Can Still Cross
• 1938. Maximum Genetic Difference Query
• 1932. Merge BSTs to Create Single BST
• 1905. Count Sub Islands
• 1858. Longest Word With All Prefixes
• 1820. Maximum Number of Accepted Invitations
• 1810. Minimum Path Cost in a Hidden Grid
• 1778. Shortest Path in a Hidden Grid
• 1766. Tree of Coprimes
• 1743. Restore the Array From Adjacent Pairs
• 1740. Find Distance in a Binary Tree
• 1722. Minimize Hamming Distance After Swap Operations
• 1676. Lowest Common Ancestor of a Binary Tree IV
• 1666. Change the Root of a Binary Tree
• 1660. Correct a Binary Tree
• 1644. Lowest Common Ancestor of a Binary Tree II
• 1631. Path With Minimum Effort
• 1625. Lexicographically Smallest String After Applying Operations
• 1612. Check If Two Expression Trees are Equivalent
• 1600. Throne Inheritance
• 1568. Minimum Number of Days to Disconnect Island
• 1559. Detect Cycles in 2D Grid
• 1530. Number of Good Leaf Nodes Pairs
• 1522. Diameter of N-Ary Tree
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1516. Move Sub-Tree of N-Ary Tree
• 1506. Find Root of N-Ary Tree
• 1490. Clone N-ary Tree
• 1485. Clone Binary Tree With Random Pointer
• 1483. Kth Ancestor of a Tree Node
• 1469. Find All The Lonely Nodes
• 1466. Reorder Routes to Make All Paths Lead to the City Zero
• 1462. Course Schedule IV
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1448. Count Good Nodes in Binary Tree
• 1443. Minimum Time to Collect All Apples in a Tree
• 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree
• 1391. Check if There is a Valid Path in a Grid
• 1382. Balance a Binary Search Tree
• 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
• 1377. Frog Position After T Seconds
• 1376. Time Needed to Inform All Employees
• 1373. Maximum Sum BST in Binary Tree
• 1372. Longest ZigZag Path in a Binary Tree
• 1367. Linked List in Binary Tree
• 1361. Validate Binary Tree Nodes
• 1339. Maximum Product of Splitted Binary Tree
• 1325. Delete Leaves With a Given Value
• 1319. Number of Operations to Make Network Connected
• 1315. Sum of Nodes with Even-Valued Grandparent
• 1306. Jump Game III
• 1305. All Elements in Two Binary Search Trees
• 1302. Deepest Leaves Sum
• 1273. Delete Tree Nodes
• 1267. Count Servers that Communicate
• 1261. Find Elements in a Contaminated Binary Tree
• 1257. Smallest Common Region
• 1254. Number of Closed Islands
• 1245. Tree Diameter
• 1242. Web Crawler Multithreaded
• 1236. Web Crawler
• 1233. Remove Sub-Folders from the Filesystem
• 1214. Two Sum BSTs
• 1203. Sort Items by Groups Respecting Dependencies
• 1202. Smallest String With Swaps
• 1192. Critical Connections in a Network
• 1161. Maximum Level Sum of a Binary Tree
• 1145. Binary Tree Coloring Game
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1120. Maximum Average Subtree
• 1110. Delete Nodes And Return Forest
• 1102. Path With Maximum Minimum Value
• 1080. Insufficient Nodes in Root to Leaf Paths
• 1042. Flower Planting With No Adjacent
• 1038. Binary Search Tree to Greater Sum Tree
• 1036. Escape a Large Maze
• 1034. Coloring A Border
• 1028. Recover a Tree From Preorder Traversal
• 1026. Maximum Difference Between Node and Ancestor
• 1022. Sum of Root To Leaf Binary Numbers
• 1020. Number of Enclaves
• 993. Cousins in Binary Tree
• 988. Smallest String Starting From Leaf
• 987. Vertical Order Traversal of a Binary Tree
• 979. Distribute Coins in Binary Tree
• 971. Flip Binary Tree To Match Preorder Traversal
• 968. Binary Tree Cameras
• 965. Univalued Binary Tree
• 959. Regions Cut By Slashes
• 951. Flip Equivalent Binary Trees
• 947. Most Stones Removed with Same Row or Column
• 938. Range Sum of BST
• 934. Shortest Bridge
• 928. Minimize Malware Spread II
• 924. Minimize Malware Spread
• 897. Increasing Order Search Tree
• 886. Possible Bipartition
• 872. Leaf-Similar Trees
• 865. Smallest Subtree with all the Deepest Nodes
• 863. All Nodes Distance K in Binary Tree
• 851. Loud and Rich
• 841. Keys and Rooms
• 839. Similar String Groups
• 834. Sum of Distances in Tree
• 827. Making A Large Island
• 814. Binary Tree Pruning
• 802. Find Eventual Safe States
• 797. All Paths From Source to Target
• 787. Cheapest Flights Within K Stops
• 785. Is Graph Bipartite?
• 783. Minimum Distance Between BST Nodes
• 778. Swim in Rising Water
• 765. Couples Holding Hands
• 756. Pyramid Transition Matrix
• 753. Cracking the Safe
• 749. Contain Virus
• 743. Network Delay Time
• 742. Closest Leaf in a Binary Tree
• 737. Sentence Similarity II
• 733. Flood Fill
• 721. Accounts Merge
• 711. Number of Distinct Islands II
• 695. Max Area of Island
• 694. Number of Distinct Islands
• 690. Employee Importance
• 687. Longest Univalue Path
• 685. Redundant Connection II
• 684. Redundant Connection
• 676. Implement Magic Dictionary
• 672. Bulb Switcher II
• 671. Second Minimum Node In a Binary Tree
• 669. Trim a Binary Search Tree
• 666. Path Sum IV
• 663. Equal Tree Partition
• 662. Maximum Width of Binary Tree
• 655. Print Binary Tree
• 653. Two Sum IV - Input is a BST
• 652. Find Duplicate Subtrees
• 642. Design Search Autocomplete System
• 637. Average of Levels in Binary Tree
• 623. Add One Row to Tree
• 617. Merge Two Binary Trees
• 606. Construct String from Binary Tree
• 590. N-ary Tree Postorder Traversal
• 589. N-ary Tree Preorder Traversal
• 582. Kill Process
• 572. Subtree of Another Tree
• 565. Array Nesting
• 563. Binary Tree Tilt
• 559. Maximum Depth of N-ary Tree
• 549. Binary Tree Longest Consecutive Sequence II
• 547. Number of Provinces
• 545. Boundary of Binary Tree
• 543. Diameter of Binary Tree
• 538. Convert BST to Greater Tree
• 536. Construct Binary Tree from String
• 530. Minimum Absolute Difference in BST
• 529. Minesweeper
• 515. Find Largest Value in Each Tree Row
• 514. Freedom Trail
• 513. Find Bottom Left Tree Value
• 508. Most Frequent Subtree Sum
• 505. The Maze II
• 501. Find Mode in Binary Search Tree
• 499. The Maze III
• 490. The Maze
• 472. Concatenated Words
• 463. Island Perimeter
• 449. Serialize and Deserialize BST
• 437. Path Sum III
• 431. Encode N-ary Tree to Binary Tree
• 430. Flatten a Multilevel Doubly Linked List
• 428. Serialize and Deserialize N-ary Tree
• 426. Convert Binary Search Tree to Sorted Doubly Linked List
• 419. Battleships in a Board
• 417. Pacific Atlantic Water Flow
• 404. Sum of Left Leaves
• 399. Evaluate Division
• 388. Longest Absolute File Path
• 386. Lexicographical Numbers
• 385. Mini Parser
• 366. Find Leaves of Binary Tree
• 365. Water and Jug Problem
• 364. Nested List Weight Sum II
• 341. Flatten Nested List Iterator
• 339. Nested List Weight Sum
• 337. House Robber III
• 333. Largest BST Subtree
• 332. Reconstruct Itinerary
• 329. Longest Increasing Path in a Matrix
• 323. Number of Connected Components in an Undirected Graph
• 314. Binary Tree Vertical Order Traversal
• 310. Minimum Height Trees
• 302. Smallest Rectangle Enclosing Black Pixels
• 298. Binary Tree Longest Consecutive Sequence
• 297. Serialize and Deserialize Binary Tree
• 285. Inorder Successor in BST
• 272. Closest Binary Search Tree Value II
• 270. Closest Binary Search Tree Value
• 269. Alien Dictionary
• 261. Graph Valid Tree
• 257. Binary Tree Paths
• 250. Count Univalue Subtrees
• 236. Lowest Common Ancestor of a Binary Tree
• 235. Lowest Common Ancestor of a Binary Search Tree
• 230. Kth Smallest Element in a BST
• 226. Invert Binary Tree
• 211. Design Add and Search Words Data Structure
• 210. Course Schedule II
• 207. Course Schedule
• 200. Number of Islands
• 199. Binary Tree Right Side View
• 156. Binary Tree Upside Down
• 145. Binary Tree Postorder Traversal
• 144. Binary Tree Preorder Traversal
• 133. Clone Graph
• 130. Surrounded Regions
• 129. Sum Root to Leaf Numbers
• 124. Binary Tree Maximum Path Sum
• 117. Populating Next Right Pointers in Each Node II
• 116. Populating Next Right Pointers in Each Node
• 114. Flatten Binary Tree to Linked List
• 113. Path Sum II
• 112. Path Sum
• 111. Minimum Depth of Binary Tree
• 110. Balanced Binary Tree
• 104. Maximum Depth of Binary Tree
• 101. Symmetric Tree
• 100. Same Tree
• 99. Recover Binary Search Tree
• 98. Validate Binary Search Tree
• 94. Binary Tree Inorder Traversal
• 79. Word Search