LeetCode

LeetCode C++ Solutions (All the solutions have passed LeetCode OJ)

(Notes: "♥" means you need buy a book from Leetcode)

#	Title	Solution	Difficulty	Problem No
166	Validate Binary Search Tree	C++	Medium	98
165	Maximum Depth of N-ary Tree	C++	Easy	559
164	Lowest Common Ancestor of a Binary Tree	C++	Medium	236
163	Lowest Common Ancestor of a Binary Search Tree	C++	Easy	235
162	Kth Smallest Element in a BST	C++	Medium	230
161	Distribute Coins in Binary Tree	C++	Medium	979
160	Convert BST to Greater Tree	C++	Easy	538
159	Sliding Window Median	C++	Hard	480
158	Binary Tree Maximum Path Sum	C++	Hard	124
157	Diameter of Binary Tree	C++	Easy	543
156	Rectangle Area II	C++	Hard	850
155	Rectangle Area	C++	Medium	223
154	Odd Even Linked List	C++	Medium	328
153	String to Integer (atoi)	C++	Medium	8
152	Number of Enclaves	C++	Medium	1020
151	Non-overlapping Intervals	C++	Medium	435
150	Middle of the Linked List	C++	Easy	876
149	Merge Intervals	C++	Medium
148	Linked List Cycle II	C++	Medium
147	K-th Smallest Prime Fraction	C++	Hard
146	Best Time to Buy and Sell Stock with Transaction Fee	C++	Medium
145	Valid Parenthesis String	C++	Medium
144	Valid Parentheses	C++	Easy
143	Symmetric Tree	C++	Easy
142	Reverse Linked List II	C++	Easy
141	Reverse Linked List	C++	Easy
140	Linked List Cycle	C++	Easy
139	Find All Anagrams in a String	C++	Easy
138	Decode String	C++	Medium
137	Container With Most Water	C++	Medium
136	Generate Parentheses	C++	Medium
135	First Unique Character in a String	C++	Easy	387
134	Find K Closest Elements	C++	Medium	658
133	Encode and Decode TinyURL	C++	Medium	535
132	Letter Combinations of a Phone Number	C++	Medium	17
131	Isomorphic Strings	C++	Easy
130	Spiral Matrix II	C++	Medium
129	Rotate Image	C++	Medium
128	Minimum Window Substring	C++	Hard
127	Min Stack	C++	Easy
126	Merge k Sorted Lists	C++	Hard
125	Maximum Product of Three Numbers	C++	Easy
124	Integer to English Words	C++	Hard
123	Largest Number	C++	Medium
122	The Skyline Problem	C++	Hard
121	Number Of Corner Rectangles ♥	C++	Medium
120	Largest Plus Sign	C++	Medium
119	4SumII	C++	Medium
118	4Sum	C++	Medium
117	Moving Average from Data Stream ♥	C++	Easy
116	Swap Nodes in Pairs	C++	Medium
115	Sort List	C++	Medium
114	Search in Rotated Sorted Array II	C++	Medium
113	Search in Rotated Sorted Array	C++	Medium
112	Remove Nth Node From End of List	C++	Medium
111	Palindrome Linked List	C++	Easy
110	Merge Two Sorted Lists	C++	Easy
109	Median of Two Sorted Arrays	C++	Hard
108	Find Minimum in Rotated Sorted Array II	C++	Hard
107	Find Minimum in Rotated Sorted Array	C++	Medium
106	Delete Node in a Linked List	C++	Easy
105	3Sum	C++	Medium
104	String Compression	C++	Easy
103	LRU Cache	C++	Hard
102	Task Scheduler	C++	Medium
101	Flood Fill	C++	Easy
100	Min Cost Climbing Stairs	C++	Easy
99	Brick Wall	C++	Medium
98	Target Sum	C++	Medium
97	Partition Equal Subset Sum	C++	Medium
96	Longest Substring Without Repeating Characters	C++	Medium
95	Decode Ways II	C++	Hard
94	Longest Consecutive Sequence	C++	Hard
93	Design Snake Game ♥	C++	Medium
92	Design Twitter	C++	Medium
91	Serialize and Deserialize Binary Tree	C++	Hard
90	Unique Binary Search Trees	C++	Medium
89	Top K Frequent Elements	C++	Medium
88	Valid Sudoku	C++	Easy
87	Sudoku Solver	C++	Hard
86	Super Pow	C++	Medium
85	Pow(x, n)	C++	Medium
84	Find Median from Data Stream	C++	Hard
83	Course Schedule II	C++	Medium
82	Course Schedule	C++	Medium
81	Trapping Rain Water II	C++	Hard
80	Trapping Rain Water	C++	Hard
79	Palindrome Partitioning II	C++	Hard
78	Palindrome Partitioning	C++	Medium
77	Maximum Gap	C++	Hard
76	Group Anagrams	C++	Medium
75	Scramble String	C++	Hard
74	Regular Expression Matching	C++	Hard
73	Longest Valid Parentheses	C++	Hard
72	Longest Absolute File Path	C++	Medium
71	Is Subsequence	C++	Medium
70	Wiggle Subsequence	C++	Medium
69	Permutations II	C++	Medium
68	Permutations	C++	Medium
67	Next Permutation	C++	Medium
66	Frog Jump	C++	Hard
65	Jump Game II	C++	Hard
64	Jump Game	C++	Medium
63	Android Lock Pattern ♥	C++	Medium
62	Guess Number Higher or Lower II	C++	Medium
61	Guess Number Higher or Lower	C++	Easy
60	Binary Tree Right Side View	C++	Medium
59	Largest Divisible Subset	C++	Medium
58	Best Time to Buy and Sell Stock with Cooldown	C++	Medium
57	Paint House II ♥	C++	Hard
56	Paint House ♥	C++	Medium
55	Roman to Integer	C++	Easy
54	Integer to Roman	C++	Medium
53	Integer Break	C++	Medium
52	Longest Palindrome	C++	Easy
51	Longest Increasing Subsequence	C++	Medium
50	Perfect Squares	C++	Medium
49	Coin Change	C++	Medium
48	Maximal Square	C++	Medium
47	Maximal Rectangle	C++	Hard
46	Largest Rectangle in Histogram	C++	Hard
45	House Robber II	C++	Medium
44	House Robber	C++	Easy
43	Triangle	C++	Medium
42	Ones and Zeroes	C++	Medium
41	Counting Bits	C++	Medium
40	Repeated Substring Pattern	C++	Easy
39	Validate IP Address	C++	Medium
38	Valid Palindrome	C++	Easy
37	Interleaving String	C++	Hard
36	Find All Numbers Disappeared in an Array	C++	Easy
35	Single Number III	C++	Medium
34	Single Number II	C++	Medium
33	Shortest Palindrome	C++	Hard
32	Clone Graph	C++	Medium
31	Sliding Window Maximum	C++	Hard
30	Longest Palindromic Substring	C++	Medium
29	Median of Two Sorted Array	C++	Hard
28	Repeated DNA Sequences	C++	Medium
27	Word Search II	C++	Hard
26	Implement Trie (Prefix Tree)	C++	Medium
25	Word Search	C++	Medium
24	Minimum Size Subarray Sum	C++	Medium
23	Spiral Matrix	C++	Medium
22	Minimum Path Sum	C++	Medium
21	Maximum Product Subarray	C++	Medium
20	Maximum Subarray	C++	Medium
19	Edit Distance	C++	Hard
18	Triangle	C++	Medium
17	Climbing Stairs	C++	Easy
16	Word Ladder II	C++	Hard
15	Word Ladder	C++	Medium
14	Word Break II	C++	Hard
13	Word Break	C++	Medium
12	Dungeon Game	C++	Hard
11	Gas Station	C++	Medium
10	Best Time to Buy and Sell Stock IV	C++	Hard
9	Best Time to Buy and Sell Stock III	C++	Hard
8	Best Time to Buy and Sell Stock II	C++	Medium
7	Best Time to Buy and Sell Stock	C++	Medium
6	Construct Binary Tree from Inorder and Postorder Traversal	C++	Medium
5	Construct Binary Tree from Preorder and Inorder Traversal	C++	Medium
4	Convert Sorted List to Binary Search Tree	C++	Medium
3	Decode Ways	C++	Medium
2	Unique Paths II	C++	Medium
1	Unique Paths	C++	Medium

SQL Questions

#	Title	Solution	Difficulty
9	Combine Two Tables	mySQL	Easy
8	Customers Who Never Order	mySQL	Easy
7	Department Highest Salary	mySQL	Easy
6	Department Highest Salary	mySQL	Easy
5	Delete Duplicate Emails	mySQL	Easy
4	Duplicate Emails	mySQL	Easy
3	Employees Earning More Than Their Managers	mySQL	Easy
2	Rising Temperature	mySQL	Easy
1	Second Highest Salary	mySQL	Easy