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finished 242/1892

Easy: 86 Medium: 137 Hard: 19

Every time a new code is added, the corresponding question will be added.

Project update from time to time, strive to update every day .

Welcome

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The project is a record of the author's leetcode.

The project is continuously updated.

Project structure

    |-- README.md
    |-- question_bank
        |-- question1
            |-- question1.py     # code
            |-- question1.md     # question
        |-- question2
            |-- question2.py
            |-- question2.md
        ……

Question Bank

ID	question	Diffculty	Pass rate	Code
1	Two Sum	Easy	0.49	🔗python
2	Add Two Numbers	Medium	0.39	🔗python
3	Longest Substring Without Repeating Characters	Medium	0.36	🔗python
4	Median of Two Sorted Arrays	Hard	0.39	🔗python
5	Longest Palindromic Substring	Medium	0.32	🔗python
6	ZigZag Conversion	Medium	0.49	🔗python
7	Reverse Integer	Easy	0.35	🔗python
8	String to Integer (atoi)	Medium	0.21	🔗python
9	Palindrome Number	Easy	0.59	🔗python
10	Regular Expression Matching	Hard	0.30	🔗python
11	Container With Most Water	Medium	0.65	🔗python
12	Integer to Roman	Medium	0.65	🔗python
13	Roman to Integer	Easy	0.62	🔗python
14	Longest Common Prefix	Easy	0.39	🔗python
15	3Sum	Medium	0.30	🔗python
16	3Sum Closest	Medium	0.46	🔗python
17	Letter Combinations of a Phone Number	Medium	0.56	🔗python
18	4Sum	Medium	0.39	🔗python
19	Remove Nth Node From End of List	Medium	0.41	🔗python
20	Valid Parentheses	Easy	0.43	🔗python
21	Merge Two Sorted Lists	Easy	0.65	🔗python
22	Generate Parentheses	Medium	0.77	🔗python
24	Swap Nodes in Pairs	Medium	0.69	🔗python
26	Remove Duplicates from Sorted Array	Easy	0.52	🔗python
27	Remove Element	Easy	0.59	🔗python
28	Implement strStr()	Easy	0.40	🔗python
31	Next Permutation	Medium	0.36	✔️
32	Longest Valid Parentheses	Hard	0.34	🔗python
34	Find First and Last Position of Element in Sorted Array	Medium	0.42	🔗python
35	Search Insert Position	Easy	0.47	🔗python
37	Sudoku Solver	Hard	0.67	🔗python
38	Count and Say	Easy	0.57	🔗python
39	Combination Sum	Medium	0.72	🔗python
40	Combination Sum II	Medium	0.64	🔗python
43	Multiply Strings	Medium	0.45	🔗python
44	Wildcard Matching	Hard	0.32	🔗python
46	Permutations	Medium	0.77	🔗python
47	Permutations II	Medium	0.62	🔗python
51	N-Queens	Hard	0.73	🔗python
52	N-Queens II	Hard	0.82	🔗python
53	Maximum Subarray	Easy	0.53	🔗python
55	Jump Game	Medium	0.41	🔗python
57	Insert Interval	Hard	0.40	🔗python
58	Length of Last Word	Easy	0.34	🔗python
60	Permutation Sequence	Hard	0.52	🔗python
61	Rotate List	Medium	0.41	🔗python
62	Unique Paths	Medium	0.63	🔗python
63	Unique Paths II	Medium	0.37	🔗python
64	Minimum Path Sum	Medium	0.68	🔗python
66	Plus One	Easy	0.46	🔗python
70	Climbing Stairs	Easy	0.51	🔗python
71	Simplify Path	Medium	0.41	🔗python
72	Edit Distance	Hard	0.60	🔗python
75	Sort Colors	Medium	0.57	🔗python
77	Combinations	Medium	0.76	🔗python
78	Subsets	Medium	0.79	🔗python
79	Word Search	Medium	0.44	🔗python
82	Remove Duplicates from Sorted List II	Medium	0.50	🔗python
83	Remove Duplicates from Sorted List	Easy	0.52	🔗python
86	Partition List	Medium	0.60	🔗python
89	Gray Code	Medium	0.69	🔗python
90	Subsets II	Medium	0.61	🔗python
91	Decode Ways	Medium	0.25	🔗python
92	Reverse Linked List II	Medium	0.52	🔗python
93	Restore IP Addresses	Medium	0.51	🔗python
94	Binary Tree Inorder Traversal	Medium	0.74	🔗python
96	Unique Binary Search Trees	Medium	0.69	🔗python
103	Binary Tree Zigzag Level Order Traversal	Medium	0.55	🔗python
104	Maximum Depth of Binary Tree	Easy	0.75	🔗python
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	0.71	🔗python
107	Binary Tree Level Order Traversal II	Easy	0.68	🔗python
109	Convert Sorted List to Binary Search Tree	Medium	0.76	🔗python
110	Balanced Binary Tree	Easy	0.55	🔗python
111	Minimum Depth of Binary Tree	Easy	0.46	🔗python
112	Path Sum	Easy	0.51	🔗python
113	Path Sum II	Medium	0.61	🔗python
116	Populating Next Right Pointers in Each Node	Medium	0.68	🔗python
117	Populating Next Right Pointers in Each Node II	Medium	0.59	🔗python
118	Pascal's Triangle	Easy	0.70	🔗python
120	Triangle	Medium	0.67	🔗python
121	Best Time to Buy and Sell Stock	Easy	0.55	🔗python
122	Best Time to Buy and Sell Stock II	Easy	0.65	🔗python
127	Word Ladder	Medium	0.46	🔗python
129	Sum Root to Leaf Numbers	Medium	0.66	🔗python
131	Palindrome Partitioning	Medium	0.70	🔗python
134	Gas Station	Medium	0.57	🔗python
136	Single Number	Easy	0.70	🔗python
137	Single Number II	Medium	0.68	🔗python
138	Copy List with Random Pointer	Medium	0.59	🔗python
139	Word Break	Medium	0.49	🔗python
141	Linked List Cycle	Easy	0.50	🔗python
142	Linked List Cycle II	Medium	0.54	🔗python
143	Reorder List	Medium	0.60	🔗python
144	Binary Tree Preorder Traversal	Medium	0.69	🔗python
145	Binary Tree Postorder Traversal	Medium	0.74	🔗python
147	Insertion Sort List	Medium	0.67	🔗python
150	Evaluate Reverse Polish Notation	Medium	0.51	🔗python
152	Maximum Product Subarray	Medium	0.41	🔗python
164	Maximum Gap	Hard	0.61	✔️
169	Majority Element	Easy	0.65	🔗python
198	House Robber	Easy	0.47	🔗python
204	Count Primes	Easy	0.38	🔗python
213	House Robber II	Medium	0.40	🔗python
215	Kth Largest Element in an Array	Medium	0.65	🔗python
216	Combination Sum III	Medium	0.74	🔗python
221	Maximal Square	Medium	0.43	🔗python
222	Count Complete Tree Nodes	Medium	0.76	🔗python
226	Invert Binary Tree	Easy	0.78	🔗python
234	Palindrome Linked List	Easy	0.45	🔗python
235	Lowest Common Ancestor of a Binary Search Tree	Easy	0.66	🔗python
236	Lowest Common Ancestor of a Binary Tree	Medium	0.66	🔗python
237	Delete Node in a Linked List	Easy	0.84	🔗python
257	Binary Tree Paths	Easy	0.66	🔗python
264	Ugly Number II	Medium	0.55	🔗python
279	Perfect Squares	Medium	0.59	🔗python
283	Move Zeroes	Easy	0.64	🔗python
300	Longest Increasing Subsequence	Medium	0.46	🔗python
303	Range Sum Query - Immutable	Easy	0.64	🔗python
304	Range Sum Query 2D - Immutable	Medium	0.47	🔗python
306	Additive Number	Medium	0.33	🔗python
309	Best Time to Buy and Sell Stock with Cooldown	Medium	0.57	🔗python
316	Remove Duplicate Letters	Medium	0.43	🔗python
322	Coin Change	Medium	0.42	🔗python
327	Count of Range Sum	Hard	0.43	✔️
328	Odd Even Linked List	Medium	0.65	🔗python
331	Verify Preorder Serialization of a Binary Tree	Medium	0.46	🔗python
332	Reconstruct Itinerary	Medium	0.44	🔗python
338	Counting Bits	Medium	0.76	🔗python
343	Integer Break	Medium	0.59	🔗python
344	Reverse String	Easy	0.74	🔗python
347	Top K Frequent Elements	Medium	0.62	🔗python
349	Intersection of Two Arrays	Easy	0.73	🔗python
357	Count Numbers with Unique Digits	Medium	0.52	🔗python
368	Largest Divisible Subset	Medium	0.39	🔗python
375	Guess Number Higher or Lower II	Medium	0.43	🔗python
376	Wiggle Subsequence	Medium	0.43	🔗python
377	Combination Sum IV	Medium	0.43	🔗python
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	0.45	✔️
392	Is Subsequence	Easy	0.51	🔗python
394	Decode String	Medium	0.54	🔗python
401	Binary Watch	Easy	0.53	🔗python
402	Remove K Digits	Medium	0.33	🔗python
404	Sum of Left Leaves	Easy	0.56	🔗python
406	Queue Reconstruction by Height	Medium	0.72	🔗python
416	Partition Equal Subset Sum	Medium	0.49	🔗python
435	Non-overlapping Intervals	Medium	0.46	🔗python
445	Add Two Numbers II	Medium	0.58	🔗python
452	Minimum Number of Arrows to Burst Balloons	Medium	0.51	🔗python
454	4Sum II	Medium	0.58	✔️
459	Repeated Substring Pattern	Easy	0.51	🔗python
463	Island Perimeter	Easy	0.71	🔗python
486	Predict the Winner	Medium	0.59	🔗python
491	Increasing Subsequences	Medium	0.56	🔗python
501	Find Mode in Binary Search Tree	Easy	0.50	🔗python
504	Base 7	Easy	0.50	🔗python
514	Freedom Trail	Hard	0.50	✔️
526	Beautiful Arrangement	Medium	0.63	🔗python
529	Minesweeper	Medium	0.65	🔗python
530	Minimum Absolute Difference in BST	Easy	0.61	🔗python
538	Convert BST to Greater Tree	Medium	0.64	🔗python
557	Reverse Words in a String III	Easy	0.74	🔗python
606	Construct String from Binary Tree	Easy	0.55	🔗python
617	Merge Two Binary Trees	Easy	0.78	🔗python
621	Task Scheduler	Medium	0.55	🔗python
637	Average of Levels in Binary Tree	Easy	0.69	🔗python
647	Palindromic Substrings	Medium	0.65	🔗python
657	Robot Return to Origin	Easy	0.78	🔗python
659	Split Array into Consecutive Subsequences	Medium	0.54	🔗python
682	Baseball Game	Easy	0.69	🔗python
685	Redundant Connection II	Hard	0.45	🔗python
725	Split Linked List in Parts	Medium	0.56	🔗python
733	Flood Fill	Easy	0.58	🔗python
746	Min Cost Climbing Stairs	Easy	0.50	🔗python
430	Flatten a Multilevel Doubly Linked List	Medium	0.52	🔗python
763	Partition Labels	Medium	0.77	🔗python
589	N-ary Tree Preorder Traversal	Easy	0.74	🔗python
771	Jewels and Stones	Easy	0.85	🔗python
701	Insert into a Binary Search Tree	Medium	0.72	🔗python
784	Letter Case Permutation	Medium	0.66	🔗python
817	Linked List Components	Medium	0.58	🔗python
834	Sum of Distances in Tree	Hard	0.54	✔️
841	Keys and Rooms	Medium	0.65	🔗python
842	Split Array into Fibonacci Sequence	Medium	0.48	🔗python
844	Backspace String Compare	Easy	0.52	🔗python
845	Longest Mountain in Array	Medium	0.42	🔗python
861	Score After Flipping Matrix	Medium	0.81	🔗python
876	Middle of the Linked List	Easy	0.70	🔗python
897	Increasing Order Search Tree	Easy	0.73	🔗python
921	Minimum Add to Make Parentheses Valid	Medium	0.73	🔗python
922	Sort Array By Parity II	Easy	0.71	🔗python
925	Long Pressed Name	Easy	0.39	🔗python
941	Valid Mountain Array	Easy	0.39	🔗python
942	DI String Match	Easy	0.72	🔗python
968	Binary Tree Cameras	Hard	0.49	🔗python
973	K Closest Points to Origin	Medium	0.63	🔗python
977	Squares of a Sorted Array	Easy	0.73	🔗python
993	Cousins in Binary Tree	Easy	0.52	🔗python
994	Rotting Oranges	Medium	0.51	🔗python
996	Number of Squareful Arrays	Hard	0.47	🔗python
1002	Find Common Characters	Easy	0.74	🔗python
1024	Video Stitching	Medium	0.57	🔗python
1025	Divisor Game	Easy	0.71	🔗python
1030	Matrix Cells in Distance Order	Easy	0.71	🔗python
1079	Letter Tile Possibilities	Medium	0.73	🔗python
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	0.78	🔗python
1291	Sequential Digits	Medium	0.51	🔗python
1122	Relative Sort Array	Easy	0.71	🔗python
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium	0.45	🔗python
1184	Distance Between Bus Stops	Easy	0.58	🔗python
1185	Day of the Week	Easy	0.61	🔗python
1207	Unique Number of Occurrences	Easy	0.73	🔗python
1239	Maximum Length of a Concatenated String with Unique Characters	Medium	0.40	🔗python
1282	Group the People Given the Group Size They Belong To	Medium	0.81	🔗python
1310	XOR Queries of a Subarray	Medium	0.65	🔗python
1356	Sort Integers by The Number of 1 Bits	Easy	0.74	🔗python
1357	Apply Discount Every n Orders	Medium	0.51	🔗python
1370	Increasing Decreasing String	Easy	0.80	🔗python
1365	How Many Numbers Are Smaller Than the Current Number	Easy	0.83	🔗python
1367	Linked List in Binary Tree	Medium	0.41	🔗python
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium	0.69	🔗python
1441	Build an Array With Stack Operations	Easy	0.64	🔗python
1566	Detect Pattern of Length M Repeated K or More Times	Easy	0.43	🔗python
1588	Sum of All Odd Length Subarrays	Easy	0.81	🔗python
1605	Find Valid Matrix Given Row and Column Sums	Medium	0.71	🔗python
1593	Split a String Into the Max Number of Unique Substrings	Medium	0.47	🔗python
面试题 05.06	Convert Integer LCCI	Easy	0.51	🔗python
面试题 02.05	Sum Lists LCCI	Medium	0.46	🔗python
面试题 08.01	Three Steps Problem LCCI	Easy	0.35	🔗python
面试题 08.04	Power Set LCCI	Medium	0.82	🔗python
面试题 08.09	Bracket LCCI	Medium	0.81	🔗python
面试题 08.12	Eight Queens LCCI	Hard	0.76	🔗python
面试题 08.07	Permutation I LCCI	Medium	0.81	🔗python
剑指 Offer 20	表示数值的字符串 LCOF	Medium	0.23	🔗python
剑指 Offer 42	连续子数组的最大和 LCOF	Easy	0.60	🔗python
剑指 Offer 38	字符串的排列 LCOF	Medium	0.55	🔗python
剑指 Offer 32 - II	从上到下打印二叉树 II LCOF	Easy	0.69	🔗python
面试题 08.08	Permutation II LCCI	Medium	0.71	🔗python
面试题 16.17	Contiguous Sequence LCCI	Easy	0.59	🔗python
面试题 02.04	Partition List LCCI	Medium	0.65	🔗python
面试题 17.16	The Masseuse LCCI	Easy	0.53	🔗python
面试题 17.10	Find Majority Element LCCI	Easy	0.58	🔗python
LCP 19	秋叶收藏集	Medium	0.52	🔗python

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