LeetCode Solutions

Solution List

1	Two Sum
2	Add Two Numbers
3	Longest Substring Without Repeating Characters
4	Median of Two Sorted Arrays
5	Longest Palindromic Substring
6	ZigZag Conversion
7	Reverse Integer
8	String to Integer (atoi)
9	Palindrome Number
10	Regular Expression Matching
11	Container With Most Water
12	Integer to Roman
13	Roman to Integer
14	Longest Common Prefix
15	3Sum
16	3Sum Closest
17	Letter Combinations of a Phone Number
18	4Sum
19	Remove Nth Node From End of List
20	Valid Parentheses
21	Merge Two Sorted Lists
22	Generate Parentheses
23	Merge k Sorted Lists
24	Swap Nodes in Pairs
25	Reverse Nodes in k-Group
26	Remove Duplicates from Sorted Array
27	Remove Element
28	Implement strStr()
29	Divide Two Integers
30	Substring with Concatenation of All Words
31	Next Permutation
32	Longest Valid Parentheses
33	Search in Rotated Sorted Array
34	Search for a Range
35	Search Insert Position
36	Valid Sudoku
37	Sudoku Solver
38	Count and Say
39	Combination Sum
40	Combination Sum II
41	First Missing Positive
42	Trapping Rain Water
43	Multiply Strings
44	Wildcard Matching
45	Jump Game II
46	Permutations
47	Permutations II
48	Rotate Image
49	Anagrams
50	Pow(x, n)
51	N-Queens
52	N-Queens II
53	Maximum Subarray
54	Spiral Matrix
55	Jump Game
56	Merge Intervals
57	Insert Interval
58	Length of Last Word
59	Spiral Matrix II
60	Permutation Sequence
61	Rotate List
62	Unique Paths
63	Unique Paths II
64	Minimum Path Sum
65	Valid Number
66	Plus One
67	Add Binary
68	Text Justification
69	Sqrt(x)
70	Climbing Stairs
71	Simplify Path
72	Edit Distance
73	Set Matrix Zeroes
74	Search a 2D Matrix
75	Sort Colors
76	Minimum Window Substring
77	Combinations
78	Subsets
79	Word Search
80	Remove Duplicates from Sorted Array II
81	Search in Rotated Sorted Array II
82	Remove Duplicates from Sorted List II
83	Remove Duplicates from Sorted List
84	Largest Rectangle in Histogram
85	Maximal Rectangle
86	Partition List
87	Scramble String
88	Merge Sorted Array
89	Gray Code
90	Subsets II
91	Decode Ways
92	Reverse Linked List II
93	Restore IP Addresses
94	Binary Tree Inorder Traversal
95	Unique Binary Search Trees II
96	Unique Binary Search Trees
97	Interleaving String
98	Validate Binary Search Tree
99	Recover Binary Search Tree
100	Same Tree
101	Symmetric Tree
102	Binary Tree Level Order Traversal
103	Binary Tree Zigzag Level Order Traversal
104	Maximum Depth of Binary Tree
105	Construct Binary Tree from Preorder and Inorder Traversal
106	Construct Binary Tree from Inorder and Postorder Traversal
107	Binary Tree Level Order Traversal I
108	Convert Sorted Array to Binary Search Tree
109	Convert Sorted List to Binary Search Tree
110	Balanced Binary Tree
111	Minimum Depth of Binary Tree
112	Path Sum
113	Path Sum II
114	Flatten Binary Tree to Linked List
115	Distinct Subsequences
116	Populating Next Right Pointers in Each Node
117	Populating Next Right Pointers in Each Node II
118	Pascal's Triangle
119	Pascal's Triangle II
120	Triangle
121	Best Time to Buy and Sell Stock
122	Best Time to Buy and Sell Stock II
123	Best Time to Buy and Sell Stock III
124	Binary Tree Maximum Path Sum
125	Valid Palindrome
126	Word Ladder II
127	Word Ladder
128	Longest Consecutive Sequence
129	Sum Root to Leaf Numbers
130	Surrounded Regions
131	Palindrome Partitioning
132	Palindrome Partitioning II
133	Clone Graph
134	Gas Station
135	Candy
136	Single Number
137	Single Number II
138	Copy List with Random Pointer
139	Word Break
140	Word Break II
141	Linked List Cycle
142	Linked List Cycle II
143	Reorder List
144	Binary Tree Preorder Traversal
145	Binary Tree Postorder Traversal
146	LRU Cache
147	Insertion Sort List
148	Sort List
149	Max Points on a Line
150	Evaluate Reverse Polish Notation
151	Reverse Words in a String
152	Maximum Product Subarray
153	Find Minimum in Rotated Sorted Array
154	Find Minimum in Rotated Sorted Array II

Progress

DONE	done
WIP	work in progress
NIP	not in-place
TODO	to do
TLE	time limit exceeded

Array

26	Remove Duplicates from Sorted Array	DONE
27	Remove Element	DONE
80	Remove Duplicates from Sorted Array II	DONE

Backtracking

37	Sudoku Solver	DONE
51	N-Queens	DONE
52	N-Queens II	DONE

Binary Search

4	Median of Two Sorted Arrays	DONE
33	Search in Rotated Sorted Array	DONE
34	Search for a Range	DONE
35	Search Insert Position	DONE
81	Search in Rotated Sorted Array II	DONE
153	Find Minimum in Rotated Sorted Array	DONE
154	Find Minimum in Rotated Sorted Array II	DONE

Binary Tree

94	Binary Tree Inorder Traversal	DONE
98	Validate Binary Search Tree	DONE
100	Same Tree	DONE
101	Symmetric Tree	DONE
102	Binary Tree Level Order Traversal	DONE
103	Binary Tree Zigzag Level Order Traversal	DONE
104	Maximum Depth of Binary Tree	DONE
107	Binary Tree Level Order Traversal II	DONE
110	Balanced Binary Tree	DONE
111	Minimum Depth of Binary Tree	DONE
112	Path Sum	DONE
113	Path Sum II	DONE
114	Flatten Binary Tree to Linked List	DONE
116	Populating Next Right Pointers in Each Node	DONE
117	Populating Next Right Pointers in Each Node II	NIP
124	Binary Tree Maximum Path Sum	DONE
129	Sum Root to Leaf Numbers	DONE
144	Binary Tree Preorder Traversal	DONE
145	Binary Tree Postorder Traversal	DONE

Bit

29	Divide Two Integers	DONE
136	Single Number	DONE

Combinatorics

17	Letter Combinations of a Phone Number	DONE
22	Generate Parentheses	DONE
31	Next Permutation	DONE
39	Combination Sum	DONE
40	Combination Sum II	DONE
46	Permutations	DONE
47	Permutations II	DONE
60	Permutation Sequence	DONE
62	Unique Paths	DONE
63	Unique Paths II	DONE
77	Combinations	DONE
78	Subsets	DONE
89	Gray Code	DONE
90	Subsets II	DONE
96	Unique Binary Search Trees	DONE

Digit

7	Reverse Integer	DONE
8	String to Integer (atoi)	DONE
9	Palindrome Number	DONE
12	Integer to Roman	DONE
13	Roman to Integer	DONE
38	Count and Say	DONE
43	Multiply Strings	DONE
50	Pow(x, n)	DONE
66	Plus One	DONE
67	Add Binary	DONE

Dynamic Programming

45	Jump Game II	DONE
53	Maximum Subarray	DONE
55	Jump Game	DONE
64	Minimum Path Sum	DONE
70	Climbing Stairs	DONE
72	Edit Distance	DONE
85	Maximal Rectangle	DONE
91	Decode Ways	DONE
121	Best Time to Buy and Sell Stock	DONE
122	Best Time to Buy and Sell Stock II	DONE
123	Best Time to Buy and Sell Stock III	DONE
131	Palindrome Partitioning	DONE
132	Palindrome Partitioning II	DONE
139	Word Break	DONE
140	Word Break II	DONE

Linked List

2	Add Two Numbers	DONE
19	Remove Nth Node From End of List	DONE
21	Merge Two Sorted Lists	DONE
23	Merge k Sorted Lists	DONE
24	Swap Nodes in Pairs	NIP
25	Reverse Nodes in k-Group	NIP

Matching

10	Regular Expression Matching	TODO
28	Implement strStr()	TODO
44	Wildcard Matching	TODO

Stack

20	Valid Parentheses	DONE
32	Longest Valid Parentheses	DONE
71	Simplify Path	DONE
84	Largest Rectangle in Histogram	DONE
150	Evaluate Reverse Polish Notation	DONE

Sum

1	Two Sum	DONE
15	3Sum	TLE
16	3Sum Closest	TODO
18	4Sum	DONE

Uncategorized

3	Longest Substring Without Repeating Characters	DONE
6	ZigZag Conversion	DONE
14	Longest Common Prefix	DONE
36	Valid Sudoku	DONE
41	First Missing Positive	DONE
49	Anagrams	DONE
54	Spiral Matrix	DONE
56	Merge Intervals	DONE
57	Insert Interval	DONE
59	Spiral Matrix II	DONE
75	Sort Colors	DONE
76	Minimum Window Substring	DONE
93	Restore IP Addresses	DONE
115	Distinct Subsequences	DONE
118	Pascal's Triangle	DONE
119	Pascal's Triangle II	DONE
120	Triangle	DONE
125	Valid Palindrome	DONE
126	Word Ladder II	DONE
127	Word Ladder	DONE
130	Surrounded Regions	DONE
134	Gas Station	DONE
135	Candy	DONE
138	Copy List with Random Pointer	DONE
141	Linked List Cycle	DONE
142	Linked List Cycle II	DONE

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leetcode-solution's Introduction

LeetCode Solutions

Solution List

Progress

Array

Backtracking

Binary Search

Binary Tree

Bit

Combinatorics

Digit

Dynamic Programming

Linked List

Matching

Stack

Sum

Uncategorized

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