leetcode-exercise

A record repository of leetcode exercise. Solution for LeetCode problems, for remember me not to relax in coding.

Year 2015

August

#	Title	Solution	Difficulty	Tag
263	Ugly Number	C++	Easy	Math
268	Missing Number	C++	Medium	Array, Math, Bit Manipulation

Year 2016

May

#	Title	Solution	Difficulty	Tag
344	Reverse String	C++	Easy	String, Two Pointers
345	Reverse Vowels of a String	C++	Easy	String, Two Pointers
67	Add Binary	C++	Easy	String, Math
78	Subsets	C++	Medium	Array, Backtracking, Bit Manipulation
86	Partition List	C++	Medium	Linked List, Two Pointers
173	Binary Search Tree Iterator	C++	Medium	Tree, Stack, Design
332	Reconstruct Itinerary	C++	Medium	DFS, Graph
235	Lowest Common Ancestor of a Binary Search Tree	C++	Easy	Tree
118	Pascal's Triangle	C++	Easy	Array
20	Valid Parentheses	C++	Easy	Stack, String
100	Same Tree	C++	Easy	Tree, DFS
104	Maximum Depth of Binary Tree	C++	Easy	Tree, DFS
121	Best Time to Buy and Sell Stock	C++	Easy	Array, Dynamic Programming
264	Ugly Number II	C++	Medium	Dynamic Programming, Heap, Math
55	Jump Game	C++	Medium	Array, Greedy
217	Contains Duplicate	C++	Easy	Array, Hash Table
219	Contains Duplicate II	C++	Easy	Array, Hash Table
220	Contains Duplicate III	C++	Medium	Binary Search Tree
133	Clone Graph	C++	Medium	DFS, BFS, Graph
231	Power of Two	C++	Easy	Math, Bit Manipulation
49	Group Anagrams	C++	Medium	Hash Table, String

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June

#	Title	Solution	Difficulty	Tag
135	Candy	C++	Hard	Greedy
51	N-Queens	C++	Hard	Backtracking
119	Pascal's Triangle II	C++	Easy	Array
102	Binary Tree Level Order Traversal	C++	Easy	Tree, BFS
128	Longest Consecutive Sequence	C++	Hard	Array, Union Find
71	Simplify Path	C++	Medium	Stack, String
205	Isomorphic Strings	C++	Easy	Hash Table
150	Evaluate Reverse Polish Notation	C++	Medium	Stack
242	Valid Anagram	C++	Easy	Hash Table, Sort
109	Convert Sorted List to Binary Search Tree	C++	Medium	DFS, Linked List
108	Convert Sorted Array to Binary Search Tree	C++	Medium	Tree, DFS
21	Merge Two Sorted Lists	C++	Easy	Linked List
349	Intersection of Two Arrays	C++	Easy	Binary Search, Hash Table, Two Pointers, Sort
143	Reorder List	C++	Medium	Linked List
52	N-Queens II	C++	Hard	Backtracking
83	Remove Duplicates from Sorted List	C++	Easy	Linked List
122	Best Time to Buy and Sell Stock II	C++	Medium	Array, Greedy
144	Binary Tree Preorder Traversal	C++	Medium	Tree, Stack
237	Delete Node in a Linked List	C++	Easy	Linked List
350	Intersection of Two Arrays II	C++	Easy	Binary Search, Hash Table, Two Pointers, Sort
226	Invert Binary Tree	C++	Easy	Tree
195	Tenth Line	Shell	Easy	Bash
215	Kth Largest Elements in an Array	C++	Medium	Heap, Divide and Conquer
111	Minimum Depth of Binary Tree	C++	Easy	Tree, DFS, BFS
110	Balanced Binary Tree	C++	Easy	Tree, DFS
257	Binary Tree Paths	C++	Easy	Tree, DFS
222	Count Complete Tree Nodes	C++	Medium	Tree, Binary Search
241	Different Ways to Add Parentheses	C++	Medium	Divide and Conquer

July

#	Title	Solution	Difficulty	Tag
287	Find the Duplicate Number	C++	Hard	Binary Search, Array, Two Pointers
342	Power of Four	C++	Easy	Bit Manipulation
136	Single Number	C++	Medium	Hash Table, Bit Manipulation
137	Single Number II	C++	Medium	Bit Manipulation
260	Single Number III	C++	Medium	Bit Manipulation
45	Jump Game II	C++	Hard	Greedy, Array
134	Gas Station	C++	Medium	Greedy
328	Odd Even Linked List	C++	Medium	Linked List
112	Path Sum	C++	Easy	Tree, DFS
113	Path Sum II	C++	Medium	Tree, DFS
303	Range Sum Query - Immutable	C++	Easy	Dynamic Programming
141	Linked List Cycle	C++	Easy	Linked List, Two Pointers
279	Perfect Squares	C++	Medium	Dynamic Programming, BFS, Math

August

#	Title	Solution	Difficulty	Tag
75	Sort Colors	C++	Medium	Array, Two Pointers, Sort
25	Reverse Nodes in k-Group	C++	Hard	Linked List
198	House Robber	C++	Easy	Dynamic Programming
213	House Robber II	C++	Medium	Dynamic Programming
337	House Robber III	C++	Medium	Tree, DFS
62	Unique Paths	C++	Medium	Array, Dynamic Programming
63	Unique Paths II	C++	Medium	Array, Dynamic Programming
10	Regular Expression Matching	C++	Hard	Dynamic Programming,
146	LRU Cache	C++	Hard	Design
105	Construct Binary Tree from Preorder and Inorder Traversal	C++	Medium	Tree, Array, DFS

September

#	Title	Solution	Difficulty	Tag
73	Set Matrix Zero	C++	Medium	Array
61	Rotate List	C++	Medium	Linked List, Two Pointers
53	Maximum Subarray	C++	Medium	Array, Dynamic Programming, Divide and Conquer
69	Sqrt(x)	C++	Medium	Binary Search, Math

October

#	Title	Solution	Difficulty	Tag
367	Valid Perfect Square	C++	Medium	Binary Search, Math
194	Max Points on a Line	C++	Hard	Hash Table, Math
199	Binary Tree Right Side View	C++	Medium	Tree, DFS, BFS
203	Remove Linked List Elements	C++	Easy	Linked List
338	Counting Bits	C++	Medium	Dynamic Progamming, Bit Manipulation
191	Number of 1 Bits	C++	Easy	Bit Manipulation
224	Basic Calculator	C++	Hard	Stack, Math

November

#	Title	Solution	Difficulty	Tag
190	Reverse Bits	C++	Easy	Bit Manipulation

Year 2017

February

#	Title	Solution	Difficulty	Tag
440	K-th Smallest in Lexicographical Order	Python	Hard	Tree
485	Max Consecutive Ones	Python	Easy	Array
455	Assign Cookies	Python, C++	Easy	Greedy
412	Fizz Buzz	Python	Easy	Math
372	Super Pow	C++	Medium	Math
473	Matchsticks to Square	C++	Medium	DFS
160	Intersection of Two Linked Lists	C++	Easy	Linked List
258	Add Digits	C++	Easy	Math
68	Text Justification	Python	Hard	String

March

#	Title	Solution	Difficulty	Tag
2	Add Two Numbers	C++	Medium	Linked List, Mat
543	Diameter of Binary Tree	C++	Easy	Tree