LeetCode 刷题笔记

#	Title	Tag
1	Two Sum	Hash Table
2	Add Two Numbers	Linked List
3	Longest Substring Without Repeating Characters	String
4	Median of Two Sorted Arrays	Array
5	Longest Palindromic Substring	String
6	ZigZag Conversion	String
7	Reverse Integer	Math
8	String to Integer	Math
9	Palindrome Number	Math
10	Regular Expression Matching	String
11	Container With Most Water	Two Pointers
14	Longest Common Prefix	String
15	3Sum	Two Pointers
16	3Sum Closet	Two Pointers
17	Letter Combinations of a Phone Number	BackTracking & DFS & BFS
18	4Sum	Two Pointers
19	Remove Nth Node From End of List	Linked List
20	Valid Parentheses	Stack & Queue
21	Merge Two Sorted Lists	Linked List
22	Generate Parentheses	BackTracking & DFS & BFS
23	Merge k Sorted Lists	Linked List
24	Swap Nodes in Pairs	Linked List
25	Reverse_Nodes_in_k Group	Linked List
26	Remove Duplicates from Sorted Array	Two Pointers
27	Remove Element	Array
28	Implement strStr()	String
29	Divide Two Integers	Math
31	Next Permutation	Array
33	Search in Rotated Sorted Array	Binary Search
34	Find First and Last Position of Element in Sorted Array	Array
35	Search Insert Position	Binary Search
37	Sudoku Solver	BackTracking & DFS & BFS
39	Combination Sum	BackTracking & DFS & BFS
40	Combination Sum II	BackTracking & DFS & BFS
41	First Missing Positive	Array
42	Trapping Rain Water	Stack & Queue
43	Multiply Strings	Math
45	3 Jump Game II	Greedy
46	Permutations	BackTracking & DFS & BFS
47	Permutations II	BackTracking & DFS & BFS
48	Rotate Image	Array
49	Group Anagrams	Sort
50	Pow(x, n)	Math
51	N Queens	BackTracking & DFS & BFS
52	N Queens II	BackTracking & DFS & BFS
53	Maximum Subarray	Sliding Window
54	Spiral Matrix	Array
55	Jump Game	Greedy
56	Merge Intervals	Sort
59	Spiral Matrix II	Array
61	Rotate List	Linked List
62	Unique Paths	Dynamic Programming
63	Unique Paths II	Dynamic Programming
64	Minimum Path Sum	Dynamic Programming
65	Valid Number	Math
67	Add Binary	Math
69	Sqrt(x)	Math
70	Climbing Stairs	Dynamic Programming
72	Edit Distance	Dynamic Programming
73	Set Matrix Zeroes	Array
74	Search a 2D Matrix	Array
75	Sort Colors	Two Pointers
76	Minimum Window Substring	Sliding Window
77	Combinations	BackTracking & DFS & BFS
78	Subsets	BackTracking & DFS & BFS
79	Word Search	BackTracking & DFS & BFS
80	Remove Duplicates from Sorted Array II	Two Pointers
82	Remove Duplicates from Sorted List II	Linked List
83	Remove Duplicates from Sorted List	Linked List
84	Largest Rectangle in Histogram	Stack & Queue
85	Maximal Rectangle	Stack & Queue
88	MergeSortedArray	Array
90	Subsets II	BackTracking & DFS & BFS
91	Decode Ways	Dynamic Programming
92	Reverse Linked List II	Linked List
94	Binary Tree Inorder Traversal	Tree
95	Unique Binary Search Trees II	Tree
96	Unique Binary Search Trees	Tree
98	Validate Binary Search Tree	Tree
100	Same Tree	Tree
101	Symmetric Tree	Tree
102	Binary Tree Level Order Traversal	Tree
103	Binary Tree Zigzag Level Order Traversal	Tree
104	Maximum Depth of Binary Tree	Tree
105	Construct Binary Tree from Preorder and Inorder Traversal	Tree
106	Construct Binary Tree from Inorder and Postorder Traversal	Tree
107	Binary Tree Level Order Traversal II	Tree
110	Balanced Binary Tree	Tree
111	Minimum Depth of Binary Tree	Tree
112	Path Sum	Tree
113	Path Sum II	Tree
115	Min Stack	Stack & Queue
118	Pascal's Triangle	Array
119	Pascal's Triangle II	Array
121	Best Time to Buy and Sell Stock	Dynamic Programming
122	Best Time to Buy and Sell Stock II	Dynamic Programming
125	Valid Palindrome	String
128	Longest Consecutive Sequence	Disjoint Set
130	Surrounded Regions	BackTracking & DFS & BFS
134	Gas Station	Greedy
136	Single Number	Bit Operation
137	Single Number II	Bit Operation
138	Copy List with Random Pointer	Linked List
141	Linked List Cycle	Linked List
142	Linked List Cycle II	Linked List
144	Binary Tree Preorder Traversal	Tree
145	Binary Tree Postorder Traversal	Tree
148	Sort List	Sort
150	Evaluate Reverse Polish Notation	Stack & Queue
151	Reverse Words in a String	String
152	Maximum Product Subarray	Dynamic Programming
153	Find_Minimum in Rotated Sorted Array	Binary Search
154	Find Minimum in Rotated Sorted Array II	Binary Search
160	Intersection of Two Linked Lists	Linked List
164	Maximum Gap	Sort
167	Two Sum II Input array is sorted	Two Pointers
168	Excel Sheet Column Title	Math
169	Majority_Element	Hash Table
171	Excel Sheet Column Number	Math
172	Factorial Trailing Zeroes	Math
179	Largest Number	Sort
191	Number of 1 Bits	Bit Operation
198	House Robber	Dynamic Programming
200	Number of Islands	BackTracking & DFS & BFS
201	Bitwise AND of Numbers Range	Bit Operation
202	Happy Number	Math
203	Remove Linked List Elements	Linked List
204	Count Primes	Math
206	Reverse Linked List	Linked List
213	House Robber II	Dynamic Programming
215	Kth Largest Element in an Array	Heap & Priority_queue
217	Contains Duplicate	Hash Table
219	Contains Duplicate II	Hash Table
220	Contains Duplicate III	Hash Table
221	Maximal Square	Dynamic Programming
225	Implement Stack using Queues	Stack & Queue
226	Invert Binary Tree	Tree
231	Power of Two	Math
232	Implement Queue using Stacks	Stack & Queue
233	Number of Digit One	Math
234	Palindrome Linked List	Linked List
236	Lowest Common Ancestor of a Binary Tree	Tree
238	Product of Array Except Self	Array
239	Sliding Window Maximum	Sliding Window
240	Search a 2D Matrix II	Array
242	Valid Anagram	Hash Table
256	Paint House	Dynamic Programming
258	Add Digits	Math
260	Single Number III	Bit Operation
263	Ugly Number	Math
264	Ugly Number II	Math
268	Missing Number	Math
276	Paint Fence	Dynamic Programming
283	Move Zeroes	Array
289	Game of Life	Bit Operation
290	Word Pattern	Hash Table
292	Nim Game	Math
295	Find Median from Data Stream	Heap & Priority_queue
300	Longest Increasing Subsequence	Dynamic Programming
312	Burst Balloons	Dynamic Programming
322	Coin Change	Dynamic Programming
326	Power of Three	Math
342	Power of Four	Math
343	Integer Break	Dynamic Programming
344	Reverse String	String
347	Top-K Frequent Elements	Heap & Priority_queue
349	Intersection of Two Arrays	Hash Table
354	Russian Doll Envelopes	Dynamic Programming
355	Design Twitter	Design
365	Water and Jug Problem	Math
367	Valid Perfect Square	Math
371	Sum of Two Integers	Math
372	Super Pow	Math
383	Ransom Note	Hash Table
389	Find the Difference	Bit Operation
392	Is Subsequence	Two Pointer
398	Random Pick Index	Reservoir Sampling
400	Nth Digit	Math
409	Longest Palindrome	String
415	Add Strings	Math
416	Partition Equal Subset Sum	Dynamic Programming
424	Longest Repeating Character Replacement	Sliding Window
438	Find All Anagrams in a String	Sliding Window
445	Add Two Numbers II	Linked List
448	Find All Numbers Disappeared in an Array	Array
455	Assign Cookies	Greedy
459	Repeated Substring Pattern	String
460	LFU Cache	Hash Table
461	Hamming Distance	Bit Operation
463	Island Perimeter	Array
466	Count The Repetitions	Dynamic Programming
470	Implement Rand10() Using Rand7()	Random
485	Max Consecutive Ones	Array
486	Predict the Winner	Dynamic Programming
491	Increasing Subsequences	BackTracking & DFS & BFS
509	Fibonacci Number	Dynamic Programming
518	Coin Change 2	Dynamic Programming
523	Continuous Subarray Sum	Hash Table
540	Single Element in a Sorted Array	Bit Operation
541	Reverse String II	String
542	01 Matrix	BackTracking & DFS & BFS
543	Diameter of Binary Tree	Tree
547	Friend Circles	Disjoint Set
557	Reverse Words in a String III	String
560	Subarray Sum Equals K	Hash Table
561	Array Partition I	Sort
572	Subtree of Another Tree	Tree
617	Merge Two Binary Trees	Tree
628	Maximum Product of Three Numbers	Math
637	Average of Levels in Binary Tree	Tree
643	Maximum Average Subarray I	Sliding Window
645	SetMismatch	Array
647	Palindromic Substrings	String
657	Robot Return to Origin	String
662	Maximum Width of Binary Tree	Tree
692	Top K Frequent Words	Heap & Priority_queue
695	Max Area of Island	BackTracking & DFS & BFS
704	Binary Search	Binary Search
724	Find Pivot Index	Array
752	Open the Lock	BackTracking & DFS & BFS
766	Toeplitz Matrix	Array
836	Rectangle Overlap	Math
844	Backspace String Compare	Stack & Queue
845	Longest Mountain in Array	Two Pointers
860	Lemonade Change	Greedy
876	Middle of the LinkedList	Linked List
887	Super Egg Drop	Dynamic Programming
888	Fair Candy Swap	Hash Table
892	Surface Area of 3D Shapes	Math
905	Sort Array By Parity	Array
912	Sort an Array	Sort
914	X of a Kind in a Deck of Cards	Math
921	Minimum Add to Make Parentheses Valid	Stack & Queue
922	Sort Array By Parity II	Array
925	Long Pressed Name	Two Pointers
945	Minimum Increment to Make Array Unique	Array
946	Validate Stack Sequences	Stack & Queue
989	Add to Array Form of Integer	Array
994	Rotting Oranges	BackTracking & DFS & BFS
999	Available Captures for Rook	BackTracking & DFS & BFS
1000	Minimum Cost to Merge Stones	Dynamic Programming
1002	Find Common Characters	String
1004	Max Consecutive Ones III	Sliding Window
1013	Partition Array Into Three Parts With Equal Sum	Array
1018	Binary Prefix Divisible By 5	Bit Operation
1051	Height Checker	Sort
1071	Greatest Common Divisor of Strings	Math
1128	Number of Equivalent Domino Pairs	Hash Table
1130	Minimum Cost Tree From Leaf Values	Dynamic Programming
1143	Longest Common Subsequence	Dynamic Programming
1160	Find Words That Can Be Formed by Characters	Hash Table
1162	As Far from Land as Possible	BackTracking & DFS & BFS
1167	Minimum Cost to Connect Sticks	Heap & Priority_queue
1200	Minimum Absolute Difference	Array
1207	Unique Number of Occurrences	Hash Table
1232	Check If It Is a Straight Line	Math
1248	Count Number of Nice Subarrays	Sliding Window
1277	Count Square Submatrices with All Ones	Dynamic Programming
1353	Maximum Number of Events That Can Be Attended	Heap & Priority_queue
1423	Maximum Points You Can Obtain from Cards	Sliding Window
1477	Find Two Non overlapping Sub arrays Each With Target Sum	Dynamic Programming
1486	XOR Operation in an Array	Bit Operation
1544	Make The String Great	Stack & Queue
1545	Find Kth Bit in Nth Binary String	String
1546	Maximum Number of Non Overlapping Subarrays With Sum Equals Target	Dynamic Programming
1547	Minimum Cost to Cut a Stick	Dynamic Programming
1684	Count the Number of Consistent Strings	String
1685	Sum of Absolute Differences in a Sorted Array	Prefix Sum
1686	Stone Game VI	Greedy
1688	Count the Number of Consistent Strings	Math
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Greedy
1690	Stone Game VII	Dynamic Programming
1694	Reformat Phone Number	String