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This repository contains the solutions and explanations to the algorithm problems on LeetCode. Only medium or above are included. All are written in C++/Python and implemented by myself. The problems attempted multiple times are labelled with hyperlinks.

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wisdompeak/LeetCode

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LeetCode难题代码和算法要点分析

目前分类目录

011.Container-With-Most-Water (M+)
015.3Sum (M)
016.3Sum-Closet (M)
018.4Sum (M)
259.3Sum-Smaller (M+)
030.Substring-with-Concatenation-of-All-Words (H)
075.Sort-Colors (M+)
026.Remove Duplicates from Sorted Array (H-)
080.Remove Duplicates from Sorted Array II (H)
209.Minimum-Size-Subarray-Sum (M)
088.Merge Sorted Array (M)
283.Move-Zeroes (M)
141.Linked-List-Cycle (E+)
142.Linked-List-Cycle-II (M+)
360.Sort-Transformed-Array (M)
713.Subarray-Product-Less-Than-K (M+)
923.3Sum-With-Multiplicity (H-)
1234.Replace-the-Substring-for-Balanced-String (H-)
1498.Number-of-Subsequences-That-Satisfy-the-Given-Sum-Condition (H-)
1574.Shortest-Subarray-to-be-Removed-to-Make-Array-Sorted (H-)
1580.Put-Boxes-Into-the-Warehouse-II (H-)
1687.Delivering-Boxes-from-Storage-to-Ports (H)
1793.Maximum-Score-of-a-Good-Subarray (M+)
1989.Maximum-Number-of-People-That-Can-Be-Caught-in-Tag (M+)
2354.Number-of-Excellent-Pairs (H-)
2422.Merge-Operations-to-Turn-Array-Into-a-Palindrome (H-)

004.Median-of-Two-Sorted-Arrays (H)
153.Find-Minimum-in-Rotated-Sorted-Array (M+)
154.Find-Minimum-in-Rotated-Sorted-Array-II (H-)    
033.Search-in-Rotated-Sorted-Array (M)
081.Search-in-Rotated-Sorted-Array-II (M)
034.Search-for-a-Range (M)
162.Find-Peak-Element (H-)
222.Count-Complete-Tree-Nodes (H-)
275.H-index II (H)
302.Smallest-Rectangle-Enclosing-Black-Pixels (M+)
475.Heaters (H-)
483.Smallest-Good-Base (H)
029.Divide-Two-Integers (M+)
644.Maximum-Average-Subarray-II (H)
658.Find-K-Closest-Elements (H)
1095.Find-in-Mountain-Array (TBD)
1157.Online-Majority-Element-In-Subarray (H-)
1533.Find-the-Index-of-the-Large-Integer (M)
1712.Ways-to-Split-Array-Into-Three-Subarrays (H)
1889.Minimum-Space-Wasted-From-Packaging (H-)
1901.Find-a-Peak-Element-II (H)
2563.Count-the-Number-of-Fair-Pairs (M+)
2819.Minimum-Relative-Loss-After-Buying-Chocolates (H)
2972.Count-the-Number-of-Incremovable-Subarrays-II (H-)

049.Group-Anagrams (M+)
149.Max-Points-on-a-Line (H)
166.Fraction-to-Recurring-Decimal (M)
170.Two-Sum-III-Data-structure-design (M)
392.Is-Subsequence (H-)
274.H-Index (H)
325.Maximum-Size-Subarray-Sum-Equals-k (M)
409.Longest-Palindrome (M)
447.Number-of-Boomerangs (E+)
438.Find-All-Anagrams-in-a-String (M+)
356.Line-Reflection (H-)
594.Longest-Harmonious-Subsequence (M+)
532.K-diff-Pairs-in-an-Array (E+)
446.Arithmetic-Slices-II-Subsequence (H)
128.Longest-Consecutive-Sequence (H-)
753.Cracking-the-Safe (H)
890.Find-and-Replace-Pattern (M+)
939.Minimum-Area-Rectangle (M+)
982.Triples-with-Bitwise-AND-Equal-To-Zero (M+) (TBD)
1074.Number-of-Submatrices-That-Sum-to-Target (M+)
1487.Making-File-Names-Unique (M+)
1573.Number-of-Ways-to-Split-a-String (M)
2131.Longest-Palindrome-by-Concatenating-Two-Letter-Words (M)
2198.Number-of-Single-Divisor-Triplets (H-)

220.Contains-Duplicate-III (M)
363.Max-Sum-of-Rectangle-No-Larger-Than-K (H)
352.Data-Stream-as-Disjoint-Intervals (H)
480.Sliding-Window-Median (H)
699.Falling-Squares (H)
729.My-Calendar-I (M)
855.Exam-Room (M+)
975.Odd-Even-Jump (H-)
632.Smallest-Range-Covering-Elements-from-K-Lists (H-)
1675.Minimize-Deviation-in-Array (H)
1296.Divide-Array-in-Sets-of-K-Consecutive-Numbers (M)
1348.Tweet-Counts-Per-Frequency (H-)
1488.Avoid-Flood-in-The-City (H-)
1606.Find-Servers-That-Handled-Most-Number-of-Requests (M)
1797.Design Authentication Manager (M)
1847.Closest-Room (M+)
1912.Design-Movie-Rental-System (M+)
2034.Stock Price Fluctuation (M)
2071.Maximum-Number-of-Tasks-You-Can-Assign (H)
2612.Minimum-Reverse-Operations (H)
2736.Maximum-Sum-Queries (H)

144.Binary-Tree-Preorder-Traversal (M+)
145.Binary-Tree-Postorder-Traversal (H-)
270.Closest-Binary-Search-Tree-Value (M+)
095.Unique-Binary-Search-Trees-II (H)
094.Binary Tree Inorder Traversal (H-)
110.Balanced-Binary-Tree (M+)
222.Count-Complete-Tree-Nodes (M+)
099.Recover-Binary-Search-Tree (H)
114.Flatten-Binary-Tree-to-Linked-List (M+)
098.Validate-Binary-Search-Tree (M)
117.Populating Next Right Pointers in Each Node II (H)
156.Binary-Tree-Upside-Down (H)
285.Inorder-Successor-in-BST (M)
298.Binary-Tree-Longest-Consecutive Sequence (M+)
450.Delete-Node-in-a-BST (H)
437.Path-Sum-III (H-)
333.Largest-BST-Subtree (H)
572.Subtree-of-Another-Tree (M)
549.Binary-Tree-Longest-Consecutive-Sequence-II (M)
173.Binary-Search-Tree-Iterator (M)
545.Boundary-of-Binary-Tree (H-)
272.Closest-Binary-Search-Tree-Value-II (M+)
226.Invert-Binary-Tree (M)
655.Print-Binary-Tree (M+)
897.Increasing-Order-Search-Tree (M+)
501.Find-Mode-in-Binary-Search-Tree (M+)
558.Quad-Tree-Intersection (M+)
662.Maximum-Width-of-Binary-Tree (H-)
742.Closest-Leaf-in-a-Binary-Tree (H)
863.All-Nodes-Distance-K-in-Binary-Tree (H-)
958.Check-Completeness-of-a-Binary-Tree (M+)
1339. Maximum-Product-of-Splitted-Binary-Tree (TBD)
1104.Path-In-Zigzag-Labelled-Binary-Tree (M+)
1660.Correct-a-Binary-Tree (M+)
1666.Change-the-Root-of-a-Binary-Tree (H-)
1932.Merge-BSTs-to-Create-Single-BST (H)
2003.Smallest-Missing-Genetic-Value-in-Each-Subtree (H)
2445.Number-of-Nodes-With-Value-One (M+)

307.Range-Sum-Query-Mutable (H-)
1526.Minimum-Number-of-Increments-on-Subarrays-to-Form-a-Target-Array (H-)
1649.Create-Sorted-Array-through-Instructions (H-)
1157.Online-Majority-Element-In-Subarray (H)
370.Range-Addition (H)
218.The-Skyline-Problem (H+)
699.Falling-Squares (H)
715.Range-Module (H)
2286.Booking-Concert-Tickets-in-Groups (H-)
2407.Longest-Increasing-Subsequence-II (H-)
2569.Handling-Sum-Queries-After-Update (H)
2907.Maximum-Profitable-Triplets-With-Increasing-Prices-I (H)
2916.Subarrays-Distinct-Element-Sum-of-Squares-II (H+)
3072.Distribute-Elements-Into-Two-Arrays-II (H-)
3161.Block-Placement-Queries (H)
3165.Maximum-Sum-of-Subsequence-With-Non-adjacent-Elements (H)
3187.Peaks-in-Array (M+)
3261.Count-Substrings-That-Satisfy-20K-Constraint-II (H-)

[Binary Index Tree]

307.Range-Sum-Query-Mutable (M)
1649.Create-Sorted-Array-through-Instructions (H)
2031.Count-Subarrays-With-More-Ones-Than-Zeros (H)
2179.Count-Good-Triplets-in-an-Array (H)
2659.Make-Array-Empty (H)

380.Insert-Delete-GetRandom-O(1) (M+)
381.Insert-Delete-GetRandom-O1-Duplicates-allowed (H-)
716.Max-Stack (M+)
355.Design-Twitter (H)
535.Encode-and-Decode-TinyURL (M)
631.Design-Excel-Sum-Formula (M+)
642.Design-Search-Autocomplete-System (M+)
895.Maximum-Frequency-Stack (H)
1146.Snapshot-Array (H)
1172.Dinner-Plate-Stacks (H)
1381.Design-a-Stack-With-Increment-Operation (H-)
1352.Product-of-the-Last-K-Numbers (M+)
1418.Display-Table-of-Food-Orders-in-a-Restaurant (H-)
1622.Fancy-Sequence (H+)
1801.Number-of-Orders-in-the-Backlog (M+)
2166.Design-Bitset (M+)

032.Longest-Valid-Parentheses (H)
155.Min-Stack (M)
225.Implement Stack using Queues (H-)
232.Implement-Queue-using-Stacks (H-)
341.Flatten-Nested-List-Iterator (M)
173.Binary-Search-Tree-Iterator (M)
536.Construct-Binary-Tree-from-String (M)
456.132-Pattern (H-)
636.Exclusive-Time-of-Functions (H-)
856.Score-of-Parentheses (M+)
946.Validate-Stack-Sequences(H-)
1190.Reverse-Substrings-Between-Each-Pair-of-Parentheses (H-)
1209.Remove-All-Adjacent-Duplicates-in-String-II (M+)
1586.Binary-Search-Tree-Iterator-II (H)
2197.Replace-Non-Coprime-Numbers-in-Array (H-)
2296.Design-a-Text-Editor (M+)
2751.Robot-Collisions (M+)
2764.is-Array-a-Preorder-of-Some-Binary-Tree (M+)

239.Sliding-Window-Maximum (H-)
862.Shortest-Subarray-with-Sum-at-Least-K (H)
1425.Constrained-Subsequence-Sum (H)
1438.Longest-Continuous-Subarray-With-Absolute-Diff-Less-Than-or-Equal-to-Limit (H)
1499.Max-Value-of-Equation (M+)
1562.Find-Latest-Group-of-Size-M (H)
1696.Jump-Game-VI (M+)
1776.Car-Fleet-II (H)
2398.Maximum-Number-of-Robots-Within-Budget (H-)
2762.Continuous-Subarrays (M+)
2969.Minimum-Number-of-Coins-for-Fruits-II (H-)

004.Median-of-Two-Sorted-Arrays (H)
373.Find-K-Pairs-with-Smallest-Sums (H-)
871.Minimum-Number-of-Refueling-Stops (H-)
1057.Campus-Bikes (H-)
1167.Minimum-Cost-to-Connect-Sticks (H-)
1439.Find-the-Kth-Smallest-Sum-of-a-Matrix-With-Sorted-Rows (H-)
1642.Furthest-Building-You-Can-Reach (H-)
1705.Maximum-Number-of-Eaten-Apples (M+)
1792.Maximum-Average-Pass-Ratio (M+)
2263.Make-Array-Non-decreasing-or-Non-increasing (H)
2386.Find-the-K-Sum-of-an-Array (H+)
2931.Maximum-Spending-After-Buying-Items (M)

037.Sudoku-Solver (M+)
040.Combination-Sum-II (M+)
051.N-Queens (M)
131.Palindrome-Partitioning (M+)
291.Word-Pattern-II (M)
417.Pacific-Atlantic-Water-Flow (M)
200.Number-of-Islands (M)
282.Expression-Add-Operators (H)
312.Burst-Balloons (H-)
351.Android-Unlock-Patterns (H-)
399.Evaluate-Division (H-)
488.Zuma-Game (H-)
425.Word-Squares (H-)
959.Regions-Cut-By-Slashes (M+)
1306.Jump-Game-III (M)
1718.Construct-the-Lexicographically-Largest-Valid-Sequence (H-)
1766.Tree-of-Coprimes (H-)
2014.Longest-Subsequence-Repeated-k-Times (H)
2056.Number-of-Valid-Move-Combinations-On-Chessboard (H)
2065.Maximum-Path-Quality-of-a-Graph (M)
2850.Minimum-Moves-to-Spread-Stones-Over-Grid (M)

127.Word-Ladder (M+)
126.Word-Ladder-II (M+)
130.Surrounded-Regions (H-)
200.Number-of-Islands (H-)
490.The-Maze (M)
529.Minesweeper (M+)
637.Average-of-Levels-in-Binary-Tree (M)
675.Cut-Off-Trees-for-Golf-Event (M)
694.Number-of-Distinct-Islands (M+)
785.Is-Graph-Bipartite (M+)
815.Bus-Routes (M+)
838.Push-Dominoes (M+)
928.Minimize-Malware-Spread-II (H-)
1036.Escape-a-Large-Maze (H)
1245.Tree-Diameter (H)
1263.Minimum-Moves-to-Move-a-Box-to-Their-Target-Location (H)
1298.Maximum-Candies-You-Can-Get-from-Boxes (M+)
1311.Get-Watched-Videos-by-Your-Friends (M)
1345.Jump-Game-IV (M+)
1559.Detect-Cycles-in-2D-Grid (M)
1568.Minimum-Number-of-Days-to-Disconnect-Island (H-)
1617.Count-Subtrees-With-Max-Distance-Between-Cities (H-)
1654.Minimum-Jumps-to-Reach-Home (H-)
1905.Count-Sub-Islands (M+)
2045.Second-Minimum-Time-to-Reach-Destination (M+)
2101.Detonate-the-Maximum-Bombs (M+)
2258.Escape-the-Spreading-Fire (H+)
2290.Minimum-Obstacle-Removal-to-Reach-Corner (M+)
2493.Divide-Nodes-Into-the-Maximum-Number-of-Groups (H-)
2812.Find-the-Safest-Path-in-a-Grid (M+)

208.Implement-Trie--Prefix-Tree (M+)
1804.Implement-Trie-II-(Prefix-Tree) (M+)
211.Add-and-Search-Word (H-)
472.Concatenated-Words (H-)
642.Design-Search-Autocomplete-System (H-)
648.Replace-Words (H)
588.Design-In-Memory-File-System (H-)
677.Map-Sum-Pairs (M)
676.Implement-Magic-Dictionary (H-)
139.Word-Break (M+)
140.Word-Break-II (M+)
212.Word-Search-II (H)
745.Prefix-and-Suffix-Search (H-)
1268.Search-Suggestions-System (H-)
1032. Stream of Characters (TBD)
1858.Longest-Word-With-All-Prefixes (M)
2416.Sum-of-Prefix-Scores-of-Strings (M)
2977.Minimum-Cost-to-Convert-String-II (H)
3093.Longest-Common-Suffix-Queries (H-)

061.Rotate-List (M)
082.Remove-Duplicates-from-Sorted-List-II (M+)
086.Partition-List (M)
142.Linked-List-Cycle-II (M+)
109.Convert-Sorted-List-to-Binary-Search-Tree (M)
369.Plus-One-Linked-List (M)
430.Flatten-a-Multilevel-Doubly-Linked-List (H-)
457.Circular-Array-Loop (H-)
708.Insert-into-a-Cyclic-Sorted-List (H-)
1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List (M+)
1670.Design-Front-Middle-Back-Queue (M+)
1756.Design-Most-Recently-Used-Queue (H)

264.Ugly-Number-II (H-)
313.Super-Ugly-Number (H-)
091.Decode-Ways (M)
639.Decode-Ways-II (H)
634.Find-the-Derangement-of-An-Array (H)
823.Binary-Trees-With-Factors (M+)
221.Maximal-Square (H-)
1277.Count-Square-Submatrices-with-All-Ones (M+)
600.Non-negative-Integers-without-Consecutive-Ones (H)
656.Coin-Path (H-)
818.Race-Car (H)
377.Combination-Sum-IV (M)
837.New-21-Game (H-)
887.Super-Egg-Drop (H)
1884.Egg-Drop-With-2-Eggs-and-N-Floors (H-)
920.Number-of-Music-Playlists (H)
940.Distinct-Subsequences-II (H)
1987.Number-of-Unique-Good-Subsequences (H)
446.Arithmetic-Slices-II-Subsequence (H-)
1027.Longest-Arithmetic-Sequence (M+)
1269.Number-of-Ways-to-Stay-in-the-Same-Place-After-Some-Steps (M+)
1316.Distinct-Echo-Substrings (M+)
1420.Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons (H-)
1444. Number of Ways of Cutting a Pizza (TBD)
1531.String-Compression-II (H+)
1575.Count-All-Possible-Routes (M+)
1621.Number-of-Sets-of-K-Non-Overlapping-Line-Segments (H)
1639.Number-of-Ways-to-Form-a-Target-String-Given-a-Dictionary (H-)
1692.Count-Ways-to-Distribute-Candies (H-)
1787.Make-the-XOR-of-All-Segments-Equal-to-Zero (H)
1872.Stone-Game-VIII (H-)
1900.The-Earliest-and-Latest-Rounds-Where-Players-Compete (H)
1937.Maximum-Number-of-Points-with-Cost (H-)
1955.Count-Number-of-Special-Subsequences (H-)
2088.Count-Fertile-Pyramids-in-a-Land (H-)
2140.Solving-Questions-With-Brainpower (H)
2189.Number-of-Ways-to-Build-House-of-Cards (H-)
2218.Maximum-Value-of-K-Coins-From-Piles (H-)
2222.Number-of-Ways-to-Select-Buildings (M+)
2312.Selling-Pieces-of-Wood (M+)
2338.Count-the-Number-of-Ideal-Arrays (H)
2431.Maximize-Total-Tastiness-of-Purchased-Fruits (M+)
2484.Count-Palindromic-Subsequences (H-)
2713.Maximum-Strictly-Inreasing-Cells-in-a-Matrix (H-)
2787.Ways-to-Express-an-Integer-as-Sum-of-Powers (M+)
2809.Minimum-Time-to-Make-Array-Sum-At-Most-x (H)
2826.Sorting-Three-Groups (M)
2851.String-Transformation (H+)
2896.Apply-Operations-to-Make-Two-Strings-Equal (H)
2979.Most-Expensive-Item-That-Can-Not-Be-Bought (M+)
3041.Maximize-Consecutive-Elements-in-an-Array-After-Modification (H-)
3082.Find-the-Sum-of-the-Power-of-All-Subsequences (H-)
3098.Find-the-Sum-of-Subsequence-Powers (H)

137.Single-Number-II (H-)
260.Single-Number-III (H)
371.Sum-of-Two-Integers (H)
318.Maximum-Product-of-Word-Lengths (M+)
342.Power-of-Four (H)
898.Bitwise-ORs-of-Subarrays (H-)
957.Prison-Cells-After-N-Days (H)
1461.Check-If-a-String-Contains-All-Binary-Codes-of-Size-K (TBD)
2505.Bitwise-OR-of-All-Subsequence-Sums (H)
2680.Maximum-OR (M+)
2802.Find-The-K-th-Lucky-Number (M+)
2992.Number-of-Self-Divisible-Permutations (M+)
3133.Minimum-Array-End (M+)

315.Count-of-Smaller-Numbers-After-Self (H-)
327.Count-of-Range-Sum (H-)
493.Reverse-Pairs (M+)
1649.Create-Sorted-Array-through-Instructions (H)
2426.Number-of-Pairs-Satisfying-Inequality (H-)

006.ZigZag-Conversion (M+)
068.Text-Justification (H)
336.Palindrome-Pairs (H-)
388.Longest-Absolute-File-Path (M+)
418.Sentence-Screen-Fitting (M+)
423.Reconstruct-Original-Digits-from-English (H-)
616.Add-Bold-Tag-in-String (M)
467.Unique-Substrings-in-Wraparound-String (H-)
564.Find-the-Closest-Palindrome (H)
722.Remove-Comments (H)
736.Parse-Lisp-Expression (H-)
816.Ambiguous-Coordinates (M+)
844.Backspace-String-Compare (M+)
1616.Split-Two-Strings-to-Make-Palindrome (M+)
1754.Largest-Merge-Of-Two-Strings (M+)
1849.Splitting-a-String-Into-Descending-Consecutive-Values (M+)
2468.Split-Message-Based-on-Limit (H-)

547.Friend-Circles (M)
200.Number-of-Islands (H-)
305.Number-of-Islands-II (H-)
130.Surrounded-Regions (H-)
128.Longest-Consecutive-Sequence (H-)
684.Redundant-Connection (M)
685.Redundant-Connection-II (H)
721.Accounts-Merge (M+)
765.Couples-Holding-Hands (H-)
785.Is-Graph-Bipartite (M+)
924.Minimize-Malware-Spread (H-)
947.Most-Stones-Removed-with-Same-Row-or-Column (M+)
959.Regions-Cut-By-Slashes (H-)
990.Satisfiability-of-Equality-Equations (M+)
1061.Lexicographically-Smallest-Equivalent-String (M)
1101.The-Earliest-Moment-When-Everyone-Become-Friends (M+)
1202.Smallest-String-With-Swaps (M+)
1319.Number-of-Operations-to-Make-Network-Connected (M+)
1632.Rank-Transform-of-a-Matrix (H)
1724.Checking-Existence-of-Edge-Length-Limited-Paths-II (H+)
1722.Minimize-Hamming-Distance-After-Swap-Operations (M+)
2076.Process-Restricted-Friend-Requests (H-)
2092.Find-All-People-With-Secret (H-)
2157.Groups-of-Strings (H)
2492.Minimum-Score-of-a-Path-Between-Two-Cities (M)
2867.Count-Valid-Paths-in-a-Tree (M+)

087.Scramble-String (H-)
133.Clone-Graph (M+)
213.House-Robber-II (H-)
337.House-Robber-III (M+)
2378.Choose-Edges-to-Maximize-Score-in-a-Tree (H-)
390.Elimination-Game (H)
395.Longest-Substring-with-At-Least-K-Repeating-Characters (H)
397.Integer-Replacement (M+)
761.Special-Binary-String (H)
779.K-th-Symbol-in-Grammar (M)
780.Reaching-Points (H-)
808.Soup-Servings (H)
880.Decoded-String-at-Index (H-)
902.Numbers-At-Most-N-Given-Digit-Set (M)
964.Least-Operators-to-Express-Number (H)
991.Broken-Calculator (M)
1088.Confusing-Number-II (H)
1199.Minimum-Time-to-Build-Blocks (H+)
1274.Number-of-Ships-in-a-Rectangle (M)
1553.Minimum-Number-of-Days-to-Eat-N-Oranges (H)
1611.Minimum-One-Bit-Operations-to-Make-Integers-Zero (H)
2998.Minimum-Number-of-Operations-to-Make-X-and-Y-Equal (M+)

332.Reconstruct-Itinerary (H)
2097.Valid-Arrangement-of-Pairs (H)
753.Cracking-the-Safe (H)
1059.All-Paths-from-Source-Lead-to-Destination (H)
1192.Critical-Connections-in-a-Network (H)
1361.Validate-Binary-Tree-Nodes (TBD)
1719.Number-Of-Ways-To-Reconstruct-A-Tree (H+)
1761.Minimum-Degree-of-a-Connected-Trio-in-a-Graph (M+)
1782.Count-Pairs-Of-Nodes (H)
2360.Longest-Cycle-in-a-Graph (M+)
2508.Add-Edges-to-Make-Degrees-of-All-Nodes-Even (H-)
2556.Disconnect-Path-in-a-Binary-Matrix-by-at-Most-One-Flip (H)
2603.Collect-Coins-in-a-Tree (H-)
2608.Shortest-Cycle-in-a-Graph (M+)
2791.Count-Paths-That-Can-Form-a-Palindrome-in-a-Tree (H)
2876.Count-Visited-Nodes-in-a-Directed-Graph (M+)
3017.Count-the-Number-of-Houses-at-a-Certain-Distance-II (H)

089.Gray-Code (M+) (aka. 1238. Circular Permutation in Binary Representation)
458.Poor-Pigs (H)
400.n-th-digit (M)
441.Arranging-Coins (M-)
628.Maximum-Product-of-Three-Numbers (M)
672.Bulb-Switcher-II (H)
754.Reach-a-Number (H)
829.Consecutive-Numbers-Sum (M)
878.Nth-Magical-Number (M+)
883.Projection-Area-of-3D-Shapes (E+)
891.Sum-of-Subsequence-Widths (M+)
899.Orderly-Queue (M)
963.Minimum-Area-Rectangle-II (H-)
964.Least-Operators-to-Express-Number (H)
972.Equal-Rational-Numbers (H)
1017.Convert-to-Base--2 (M+)
1073.Adding-Two-Negabinary-Numbers (H-)
1025.Divisor-Game (M)
1040.Moving-Stones-Until-Consecutive-II (H)
1015.Smallest-Integer-Divisible-by-K (M+)
1103.Distribute-Candies-to-People (M+)
1330.Reverse-Subarray-To-Maximize-Array-Value (TBD)
1250.Check-If-It-Is-a-Good-Array (M+)
1680.Concatenation-of-Consecutive-Binary-Numbers (M)
1739.Building-Boxes (H-)
1806.Minimum-Number-of-Operations-to-Reinitialize-a-Permutation (H)
1922.Count-Good-Numbers (M)
1969.Minimum-Non-Zero-Product-of-the-Array-Elements (M+)
2128.Remove-All-Ones-With-Row-and-Column-Flips (M+)
2217.Find-Palindrome-With-Fixed-Length (M+)

055.Jump-Game (E+)
045.Jump-Game-II (M)
134.Gas-Station (H)
659.Split-Array-into-Consecutive-Subsequences (H)
386.Lexicographical-Numbers (H)
624.Maximum-Distance-in-Arrays (M)
665.Non-decreasing-Array (H)
670.Maximum-Swap (M+)
649.Dota2-Senate (H)
683.K-Empty-Slots (H)
517.Super-Washing-Machines (H)
870.Advantage-Shuffle (M)
781.Rabbits-in-Forest (M+)
881.Boats-to-Save-People (H-)
910.Smallest-Range-II (M+)
916.Word-Subsets (M+)
936.Stamping-The-Sequence (H)
948.Bag-of-Tokens (M+)
968.Binary-Tree-Cameras (H)
955.Delete-Columns-to-Make-Sorted-II (M+)
1040.Moving-Stones-Until-Consecutive-II (H)
1121.Divide Array Into Increasing Sequences (TBD)
1191.K-Concatenation-Maximum-Sum (M+)
1253.Reconstruct-a-2-Row-Binary-Matrix (M)
1354.Construct-Target-Array-With-Multiple-Sums (H-)
1414.Find-the-Minimum-Number-of-Fibonacci-Numbers-Whose-Sum-Is-K (M+)
1505.Minimum-Possible-Integer-After-at-Most-K-Adjacent-Swaps-On-Digits (H)
1535.Find-the-Winner-of-an-Array-Game (M+)
1536.Minimum-Swaps-to-Arrange-a-Binary-Grid (H-)
1540.Can-Convert-String-in-K-Moves (M+)
1567.Maximum-Length-of-Subarray-With-Positive-Product (M+)
1578.Minimum-Deletion-Cost-to-Avoid-Repeating-Letters (M)
1585.Check-If-String-Is-Transformable-With-Substring-Sort-Operations (H)
1657.Determine-if-Two-Strings-Are-Close (M)
1702.Maximum-Binary-String-After-Change (H-)
1717.Maximum-Score-From-Removing-Substrings (M+)
1727.Largest-Submatrix-With-Rearrangements (M)
1744.Can-You-Eat-Your-Favorite-Candy-on-Your-Favorite-Day (M)
1788.Maximize-the-Beauty-of-the-Garden (M+)
1818.Minimum-Absolute-Sum-Difference (M+)
1850.Minimum-Adjacent-Swaps-to-Reach-the-Kth-Smallest-Number (M+)
1911.Maximum-Alternating-Subsequence-Sum (M+)
2086.Minimum-Number-of-Buckets-Required-to-Collect-Rainwater-from-Houses (M+)
2136.Earliest-Possible-Day-of-Full-Bloom (M+)
2170.Minimum-Operations-to-Make-the-Array-Alternating (M+)
2171.Removing-Minimum-Number-of-Magic-Beans (M)
2182.Construct-String-With-Repeat-Limit (M+)
2193.Minimum-Number-of-Moves-to-Make-Palindrome (H+)
2216.Minimum-Deletions-to-Make-Array-Beautiful (M+)
2242.Maximum-Score-of-a-Node-Sequence (M+)
2257.Count-Unguarded-Cells-in-the-Grid (M+)
2271.Maximum-White-Tiles-Covered-by-a-Carpet (M+)
2275.Largest-Combination-With-Bitwise-AND-Greater-Than-Zero (M+)
2306.Naming-a-Company (H-)
2311.Longest-Binary-Subsequence-Less-Than-or-Equal-to-K (H-)
2332.The-Latest-Time-to-Catch-a-Bus (H-)
2350.Shortest-Impossible-Sequence-of-Rolls (M+)
2365.Task-Scheduler-II (M)
2366.Minimum-Replacements-to-Sort-the-Array (H-)
2371.Minimize-Maximum-Value-in-a-Grid (M+)
2449.Minimum-Number-of-Operations-to-Make-Arrays-Similar (M+)
2457.Minimum-Addition-to-Make-Integer-Beautiful (M)
2546.Apply-Bitwise-Operations-to-Make-Strings-Equal (M+)
2551.Put-Marbles-in-Bags (M+)
2561.Rearranging-Fruits (H-)
2598.Smallest-Missing-Non-negative-Integer-After-Operations (M)
2813.Maximum-Elegance-of-a-K-Length-Subsequence (H-)
2835.Minimum-Operations-to-Form-Subsequence-With-Target-Sum (M+)
2871.Split-Array-Into-Maximum-Number-of-Subarrays (M+)
2868.The-Wording-Game (M)
2897.Apply-Operations-on-Array-to-Maximize-Sum-of-Squares (M+)
3022.Minimize-OR-of-Remaining-Elements-Using-Operations (H)
3219.Minimum-Cost-for-Cutting-Cake-II (H)

2061.Number-of-Spaces-Cleaning-Robot-Cleaned (M)
2069.Walking-Robot-Simulation-II (M+)
2532.Time-to-Cross-a-Bridge (H)

007.Reverse-Integer (M)
048.Rotate-Image (M+)
065.Valid-Number (H-)
158.Read-N-Characters-Given-Read4-II-Call-multiple-times (H-)
240.Search-a-2D-Matrix-II (M+)
277.Find-the-Celebrity (H-)
311.Sparse-Matrix-Multiplication (M)
168.Excel-Sheet-Column-Title (H)
453.Minimum-Moves-to-Equal-Array-Elements (M)
782.Transform-to-Chessboard (H+)
466.Count-The-Repetitions (H)
810.Chalkboard-XOR-Game (H)
420.Strong-Password-Checker (H)
775.Global-and-Local-Inversions (M)
348.Design-Tic-Tac-Toe (M)
794.Valid-Tic-Tac-Toe-State (M+)
825.Friends-Of-Appropriate-Ages (M+)
835.Image-Overlap (H)
843.Guess-the-Word (M)
918.Maximum-Sum-Circular-Subarray (H-)
927.Three-Equal-Parts (M)
978.Longest-Turbulent-Subarray (H-)
1183.Maximum-Number-of-Ones (H)
1224.Maximum-Equal-Frequency (H) (aka. 2423. Remove Letter To Equalize Frequency)
1267.Count-Servers-that-Communicate (M+)
1538.Guess-the-Majority-in-a-Hidden-Array (M+)
1706.Where-Will-the-Ball-Fall (M+)
1749.Maximum-Absolute-Sum-of-Any-Subarray (M+)
1752.Check-if-Array-Is-Sorted-and-Rotated (M)
1826.Faulty-Sensor (M+)
1861.Rotating-the-Box (M)
1862.Sum-of-Floored-Pairs (M+)
1904.The-Number-of-Full-Rounds-You-Have-Played (M)
1997.First-Day-Where-You-Have-Been-in-All-the-Rooms (H)
2018.Check-if-Word-Can-Be-Placed-In-Crossword (M+)
2147.Number-of-Ways-to-Divide-a-Long-Corridor (M)
2337.Move-Pieces-to-Obtain-a-String (aka. 777.Swap-Adjacent-in-LR-String) (M+)
2359.Find-Closest-Node-to-Given-Two-Nodes (M)
2380.Time-Needed-to-Rearrange-a-Binary-String (H)
2453.Destroy-Sequential-Targets (M)
2591.Distribute-Money-to-Maximum-Children (M+)
2647.Color-the-Triangle-Red (H)
2718.Sum-of-Matrix-After-Queries (M+)
2808.Minimum-Seconds-to-Equalize-a-Circular-Array (M+)
2811.Check-if-it-is-Possible-to-Split-Array (M+)
3068.Find-the-Maximum-Sum-of-Node-Values (M+)

2860.Happy-Students (M+)
2862.Maximum-Element-Sum-of-a-Complete-Subset-of-Indices (H-)
2910.Minimum-Number-of-Groups-to-Create-a-Valid-Assignment (H-)
2939.Maximum-Xor-Product (H-)
2957.Remove-Adjacent-Almost-Equal-Characters (M)
330.Patching-Array (H)
1798.Maximum-Number-of-Consecutive-Values-You-Can-Make (H-)
2952.Minimum-Number-of-Coins-to-be-Added (H-)

LCP23.魔术排列
LCP24.数字游戏
LCP25.古董键盘
LCP32.批量处理任务
LCP35.电动车游城市
LCP36.最多牌组数
LCP43.十字路口的交通

Math
Binary_Index_Tree
Segment Tree
Inverse_Element
Graph
Bit_Manipulation
RB_Tree
二维子矩阵求和
二维差分数组
CPP_LANG

About

This repository contains the solutions and explanations to the algorithm problems on LeetCode. Only medium or above are included. All are written in C++/Python and implemented by myself. The problems attempted multiple times are labelled with hyperlinks.

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