juniway's coding stack
leetcoding
Introduction
1. Array
1.1 (1) 2 Sum
1.2 (167) 2 Sum II - Input array is sorted
1.3 (15) 3 Sum
1.4 (16) 3 Sum Closest
1.5 (259) 3 Sum Smaller
1.6 (18) 4 Sum
1.7 (4) Median of two Sorted Arrays
1.8 (26) Remove Duplicates from Sorted Array
1.9 (27) Remove Element
1.10 (41) First Missing Positive
1.11 (34) Search for a Range
1.12 (35) Search Insert Position
1.13 (11) Container With Most Water
1.14 (31) Next Permutation
1.15 (33) Search in Rotated Sorted Array
1.16 (39) Combination Sums
1.17 (40) Combination SumsII
1.18 (42) Trapping Rain Water
1.19 (45) Jump Game II
1.20 (55) Jump Game
1.21 (48) Rotate Image
1.22 (53) Maximum Subarray
1.23 (54) Spiral Matrix
1.24 (56) Merge Intervals
1.25 (57) Insert Interval
1.26 (59) Spiral Matrix II
1.27 (62) Unique Paths
1.28 (63) Unique Paths II
1.29 (64) Minimum PathsSum
1.30 (66) Plus One
1.31 (73) Set Matrix Zeroes
1.32 (74) Search a 2D Matrix
1.33 (75) Sort Colors
1.34 (78) Subsets
1.35 (79) Word Search
1.36 (80) Remove Duplicates from Sorted Array II
1.37 (81) Search in Rotated Sorted Array II
1.38 (84) Largest Rectangle in Histogram
1.39 (85) Maximal Rectangle
1.40 (88) Merge Sorted Array
1.41 (90) Subsets II
1.42 (105) Construct Binary Tree from Preorder and Inorder Traversal
1.43 (106) Construct Binary Tree from Inorder and Postorder Traversal
1.44 (118) Pascal's Triangle
1.45 (119) Pascal's Triangle II
1.46 (120) Triangle
1.47 (121) Best Time to Buy and Sell Stock
1.48 (122) Best Time to Buy and Sell Stock II
1.49 (123) Best Time to Buy and Sell Stock III
1.50 (126) Word Ladder II
1.51 (128) Longest Consecutive Sequence
1.52 (152) Maximum Product Subarray
1.53 (153) Find Minimum in Rotated Sorted Array
1.54 (154) Find Minimum in Rotated Sorted Array II
1.55 (162) Find Peak Element
1.56 (163) Missing Ranges
1.57 (169) Majority Element
1.58 (189) Rotate Array
1.59 (209) Minimum Size Subarray Sum
1.60 (216) Combination Sum III
1.61 (217) Contains Duplicate
1.62 (219) Contains Duplicate II
1.63 (220) Contains Duplicate III
1.64 (228) Summary Ranges
1.65 (229) Majority Element II
1.66 (238) Product of Array Except Self
1.67 (243) Shortest Word Distance
1.68 (245) Shortest Word Distance III
1.69 (268) Missing Number
1.70 (277) Find the Celebrity
1.71 (280) Wiggle Sort
1.72 (283) Move Zeroes
1.73 (287) Find the Duplicate Number
1.74 (289) Game of Life
1.75 (370) Range Addition
1.76 (380) Insert Delete GetRandom O(1)
1.77 (381) Insert Delete GetRandom O(1) - Duplicates allowed
1.78 (396) Rotate Function
1.79 (414) Third Maximum Number
2. Linked List
2.1 (2) Add Two Numbers
2.2 (19) Remove Nth Node
2.3 (21) Merge Two Sorted Lists
2.4 (23) Merge K Sorted Lists
2.5 (24) Swap Nodes in Pair
2.6 (25) Reverse Nodes in K Group
2.7 (61) Rotate List
2.8 (82) Remove Duplicates From Sorted List II
2.9 (83) Remove Duplicates From Sorted List
2.10 (86) Partition List
2.11 (92) Reverse Linked List II
2.12 (109) Convert Sorted List To Binary Search Tree
2.13 (138) Copy List With Random Pointer
2.14 (141) Linked List Cycle
2.15 (142) Linked List Cycle II
2.16 (143) Reorder List
2.17 (147) Insertion Sort List
2.18 (148) Sort List
2.19 (160) Intersection of Two Linked Lists
2.20 (203) Remove Linked List Elements
2.21 (206) Reverse Linked List
2.22 (234) Palindrome Linked List
2.23 (237) Delete Node in a Linked List
2.24 (328) Odd Even Linked List
2.25 (369) Plus One Linked List
3. String
3.1 (3) Longest Substring Without Repeating Characters
3.2 (5) Longest Palindromic Substring
3.3 (6) Zig Zag Conversion
3.4 (8) String To Integer
3.5 (12) Integer To Roman
3.6 (13) Roman To Integer
3.7 (14) Longest Common Prefix
3.8 (17) Letter Combination
3.9 (20) Valid Parentheses
3.10 (22) Generate Parentheses
3.11 (28) Implementstr Str
3.12 (30) Substring With Concatenation of All Words
3.13 (38) Count and Say
3.14 (43) Multiply Strings
3.15 (49) Group Anagrams
3.16 (58) Length of Last Word
3.17 (65) Valid Number
3.18 (67) Add Binary
3.19 (68) Text Justification
3.20 (71) Simplify Path
3.21 (76) Minimum Window Substring
3.22 (93) Restore I P Addresses
3.23 (97) Interleaving String
3.24 (125) Valid Palindrome
3.25 (132) Palindrome Partitioning II
3.26 (139) Word Break
3.27 (151) Reverse Words in String
3.28 (157) Read N Characters Given Read 4
3.29 (158) Read N Characters Given Read 4 II
3.30 (165) Compare Version Number
3.31 (186) Reverse Words Ina String II
3.32 (214) Shortest Palindrome
3.33 (227) Basic Calculator II
3.34 (271) Encode and Decode Strings
3.35 (273) Integer To English Words
3.36 (291) Word Pattern II
3.37 (336) Palindrome Pairs
3.38 (344) Reverse String
3.39 (345) Reverse Vowels of a String
3.40 (358) Rearrange String K Distance Apart
3.41 (383) Ransom Note
3.42 (385) Mini Parser
3.43 (387) First Unique Character in a String
3.44 (388) Longest Absolute File Path
3.45 (408) Valid Word Abbreviation
4. Hash Table
4.1 (36) Valid Sudoku
4.2 (136) Single Number
4.3 (149) Max Points On a Line
4.4 (166) Fraction To Recurring Decimal
4.5 (187) Repeated D N a Sequences
4.6 (202) Happy Number
4.7 (204) Count Primes
4.8 (205) Isomorphic Strings
4.9 (242) Valid Anagram
4.10 (246) Strobogrammatic Number
4.11 (249) Group Shifted Strings
4.12 (269) Alien Dictionary
4.13 (274) H Index
4.14 (290) Word Pattern
4.15 (299) Bulls and Cows
4.16 (347) Top K Frequent Elements
4.17 (349) Intersection of Two Arrays
4.18 (350) Intersection of Two Arrays II
4.19 (355) Design Twitter
4.20 (389) Find The Difference
4.21 (409) Longest Palindrome
4.22 (438) Find All Anagrams in a String
4.23 (447) Number of Boomerangs
4.24 (454) 4Sum II
5. Stack
5.1 (150) Evaluate Reverse Polish Notation
5.2 (155) Min Stack
5.3 (224) Basic Calculator
5.4 (225) Implement Stack Using Queues
5.5 (232) Implement Queue Using Stacks
5.6 (341) Flatten Nested List Iterator
5.7 (394) Decode String
6. Queue
6.1 (346) Moving Average From Data Stream
7. Heap
7.1 (215) Kth Largest Element in an Array
7.2 (239) Sliding Window Maximum
7.3 (295) Find Median From Data Stream
7.4 (313) Super Ugly Number
7.5 (360) Sort Transformed Array
7.6 (373) Find K Pairs With Smallest Sums
7.7 (407) Trapping Rain Water II
8. Graph
8.1 (261) Graph Valid Tree
8.2 (323) Number of Connected Components in an Undirected Grap
8.3 (399) Evaluate Division
9. Bit Manipulation
9.1 (137) Single Number II
9.2 (190) Reverse Bits
9.3 (191) Number of 1 Bits
9.4 (201) Bitwise and of Numbers Range
9.5 (231) Power of Two
9.6 (260) Single Number II I
9.7 (318) Maximum Product of Word Lengths
9.8 (342) Power of Four
9.9 (371) Sum of Two Integers
9.10 (393) UTF8 Validation
9.11 (397) Integer Replacement
9.12 (405) Convert a Number To Hexadecimal
9.13 (421) Maximum XOR of Two Numbers in an Array
10. Tree
10.1 (94) Binary Tree Inorder Traversal
10.2 (98) Validate Binary Search Tree
10.3 (99) Recover Binary Search Tree
10.4 (100) Same Tree
10.5 (101) Symmetric Tree
10.6 (102) Binary Tree Level Order Traversal
10.7 (103) Binary Tree Zigzag Level Order Traversal
10.8 (104) Maximum Depthof Binary Tree
10.9 (107) Binary Tree Level Order Traversal II
10.10 (108) Convert Sorted Array To Binary Search Tree
10.11 (110) Balanced Binary Tree
10.12 (111) Minimum Depthof Binary Tree
10.13 (112) Path Sum
10.14 (113) Path Sum II
10.15 (114) Flatten Binary Tree To Linked List
10.16 (116) Populating Next Right Pointers in Each Node
10.17 (117) Populating Next Right Pointers in Each Node II
10.18 (124) Binary Tree Maximum Path Sum
10.19 (129) Sum Root To Leaf Numbers
10.20 (144) Binary Tree Preorder Traversal
10.21 (145) Binary Tree Postorder Traversal
10.22 (156) Binary Tree Upside Down
10.23 (173) Binary Search Tree Iterator
10.24 (199) Binary Tree Right Side View
10.25 (218) The Skyline Problem
10.26 (220) Contain Duplicate II I
10.27 (222) Count Complete Tree Nodes
10.28 (226) Invert Binary Tree
10.29 (230) Kth Smallest Element Ina B S T
10.30 (235) Lowest Common Ancestor of a Binary Search Tree
10.31 (236) Lowest Common Ancestor of a Binary Tree
10.32 (250) Count Univalue Subtrees
10.33 (255) Verify Preorder Sequence in Binary Search Tree
10.34 (257) Binary Tree Paths
10.35 (270) Closest Binary Search Tree Value
10.36 (272) Closest Binary Search Tree Value II
10.37 (285) Inorder Successor in B S T
10.38 (297) Serialize and Deserialize Binary Tree
10.39 (298) Binary Tree Longest Consecutive Sequence
10.40 (307) Range Sum Query Mutable
10.41 (314) Binary Tree Vertical Order Traversal
10.42 (315) Count of Smaller Numbers After Self
10.43 (327) Count of Range Sum
10.44 (333) Largest B S T Subtree
10.45 (337) House Robber II I
10.46 (352) Data Stream As Disjoint Intervals
10.47 (366) Find Leaves of Binary Tree
10.48 (404) Sum of Left Leaves
10.49 (437) Path Sum II I
11. Binary Search
11.1 (29) Divide Two Integers
11.2 (50) Pow X N
11.3 (69) Sqrtx
11.4 (240) Search a 2 D Matrix II
11.5 (275) H Index II
11.6 (278) First Bad Version
11.7 (367) Valid Perfect Square
11.8 (374) Guess Number Higher Or Lower
11.9 (378) Kth Smallest Element in a Sorted Matrix
11.10 (436) Find Right Interval
11.11 (441) Arranging Coins
12. Bfs & Dfs
12.1 (130) Surrounded Regions
12.2 (133) Clone Graph
12.3 (200) Number of Islands
12.4 (207) Course Schedule
12.5 (210) Course Schedule II
12.6 (301) Remove Invalid Parentheses
12.7 (310) Minimum Height Trees
12.8 (329) Longest Increasing Path in a Matrix
12.9 (332) Reconstruct Itinerary
12.10 (417) Pacific Atlantic Water Flow
13. Backtracking
13.1 (37) Sudoku Solver
13.2 (46) Permutations
13.3 (47) Permutations II
13.4 (51) N Queens
13.5 (52) N Queens II
13.6 (60) Permutation Sequence
13.7 (77) Combinations
13.8 (89) Gray Code
13.9 (131) Palindrome Partitioning
13.10 (211) Add and Search Word Data Structure Design
13.11 (212) Word Search II
13.12 (254) Factor Combinations
13.13 (266) Palindrome Permutation
13.14 (267) Palindrome Permutation II
13.15 (401) Binary Watch
14. Divide and Conquer
14.1 (241) Different Ways To Add Parentheses
14.2 (282) Expression Add Operators
15. Dynamic Programming
14.1 (10) Regular Express Match
15.2 (32) Longest Valid Parentheses
15.3 (44) Wildcard Matching
15.4 (70) Climbing Stairs
15.5 (72) Edit Distance
15.6 (87) Scramble String
15.7 (91) Decode Ways
15.8 (95) Unique Binary Search Trees II
15.9 (96) Unique Binary Search Trees
15.10 (115) Distinct Subsequences
15.11 (127) Word Ladder
15.12 (140) Word Break II
15.13 (159) Longest Substring With At Most Two Distinct Characters
15.14 (161) One Edit Distance
15.15 (174) Dungeon Game
15.16 (188) Best Timeto Buy and Sell Stock IV
15.17 (198) House Robber
15.18 (213) House Robber II
15.19 (221) Maximal Square
15.20 (244) Shortest Worddistance II
15.21 (256) Paint House
15.22 (264) Ugly Number II
15.23 (265) Paint House II
15.24 (279) Perfect Squares
15.25 (300) Longest Increasing Subsequence
15.26 (303) Range Sum Query Immutable
15.27 (304) Range Sum Query 2 D Immutable
15.28 (309) Best Time To Buy and Sell Stock With Cooldown
15.29 (312) Burst Balloons
15.30 (317) Shortest Distance From All Buildings
15.31 (321) Create Maximum Number
15.32 (322) Coin Change
15.33 (325) Maximum Size Subarray Sum Equals K
15.34 (334) Increasing Triplet Subsequence
15.35 (338) Counting Bits
15.36 (340) Longest Substring With At Most K Distinct Characters
15.37 (343) Integer Break
15.38 (354) Russian Doll Envelopes
15.39 (357) Count Numbers With Unique Digits
15.40 (363) Max Sum of Rectangle No Larger Than K
15.41 (368) Largest Divisible Subset
15.42 (375) Guess Number Higher Or Lower II
15.43 (376) Wiggle Subsequence
15.44 (377) Combination Sum IV
15.45 (392) Is Subsequence
15.46 (395) Longest Substring With At Least K Repeating Characters
15.47 (403) Frog Jump
15.48 (410) Split Array Largest Sum
15.49 (411) Minimum Unique Word Abbreviation
15.50 (413) Arithmetic Slices
15.51 (416) Partition Equal Subset Sum
15.52 (424) Longest Repeating Character Replacement
15.53 (446) Arithmetic Slices II Subsequence
16. Greedy
16.1 (55) Jump Game
16.2 (134) Gas Station
16.3 (135) Candy
16.4 (316) Remove Duplicate Letters
16.5 (330) Patching Array
16.6 (402) Remove K Digits
16.7 (406) Queue Reconstruction By Height
16.8 (435) Non Overlapping Intervals
16.9 (452) Minimum Number of Arrows To Burst Balloons
17. Sort
17.1 (163) Maximum Gap
17.2 (179) Largest Number
17.3 (324) Wiggle Sort II
17.4 (331) Verify Preorder Serialization of a Binary Tree
18. Math
18.1 (7) Reverse Integer
18.2 (9) Palindrome Number
18.3 (168) Excel Sheet Column Title
18.4 (171) Excel Sheet Column Number
18.5 (172) Factorial Trailing Zeroes
18.6 (223) Rectangle Area
18.7 (233) Number of Digit One
18.8 (258) Add Digits
18.9 (263) Ugly Number
18.10 (306) Additive Number
18.11 (319) Bulb Switcher
18.12 (326) Power of Three
18.13 (335) Self Crossing
18.14 (365) Water and Jug Problem
18.15 (372) Super Pow
18.16 (400) Nth Digit
18.17 (415) Add Strings
18.18 (423) Reconstruct Original Digits From English
18.19 (453) Minimum Moves To Equal Array Elements
19. Design
19.1 (146) LRU
19.2 (170) Two Sum I I I Data Structure Design
19.3 (208) Implement Trie Prefix Tree
19.4 (251) Flatten 2 D Vector
19.5 (281) Zigzag Iterator
19.6 (284) Peeking Iterator
19.7 (293) Flip Game
19.8 (294) Flip Game I I
19.9 (348) Design Tic Tac Toe
19.10 (351) Android Unlock Patterns
19.11 (353) Design Snake Game
19.12 (359) Logger Rate Limiter
19.13 (362) Design Hit Counter
19.14 (379) Design Phone Directory
19.15 (390) Elimination Game
19.16 (420) Strong Password Checker
19.17 (432) All Oone Data Structure
19.18 (439) Ternary Expression Parser
19.19 (444) Sequence Reconstruction
20. Other
20.1 (247) Strobogrammatic Number I I
20.2 (248) Strobogrammatic Number I I I
20.3 (252) Meeting Rooms
20.4 (253) Meeting Rooms I I
20.5 (259) 3 Sum Smaller
20.6 (276) Paint Fence
20.7 (277) Find The Celebrity
20.8 (286) Walls and Gates
20.9 (288) Unique Word Abbreviation
20.10 (292) Nim Game
20.11 (296) Best Meeting Point
20.12 (302) Smallest Rectangle Enclosing Black Pixels
20.13 (305) Number of Islands I I
20.14 (308) Range Sum Query 2 D Mutable
20.15 (311) Sparse Matrix Multiplication
20.16 (320) Generalized Abbreviation
20.17 (339) Nested List Weight Sum
20.19 (356) Line Reflection
20.20 (361) Bomb Enemy
20.21 (364) Nested List Weight Sum I I
20.22 (382) Linked List Random Node
20.23 (384) Shuffle an Array
20.24 (386) Lexicographical Numbers
20.25 (391) Perfect Rectangle
20.26 (398) Random Pick Index
20.27 (412) Fizz Buzz
20.28 (418) Sentence Screen Fitting
20.29 (419) Battleships in a Board
20.30 (422) Valid Word Square
20.31 (425) Word Squares
20.32 (440) Kth Smallest in Lexicographical Order
21. Sql
21.1 (175) Combine Two Tables
21.2 (176) Second Highest Salary
21.3 (177) Nth Highest Salary
21.4 (178) Rank Scores
21.5 (180) Consecutive Number
21.6 (181) Employees Earning More Than Their Manager
21.7 (182) Duplicate Emails
21.8 (183) Customers Who Never Order
21.9 (184) Department Highest Salary
21.10 (185) Department Top Three Salaries
21.11 (196) Delete Duplicate Emails
21.12 (197) Rising Temperature
21.13 (262) Trips and Users
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1. Array
Array is a sequential collection that allows random access
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