README.md

LeetCode Java Practices

LeetCode练习记录，JDK版本是11

可以通过题目名称的大驼峰来搜索，也可以通过题号来搜索，大体思路一般会在commit message里面，详细的思路一般会在注释中

项目拉下来直接导入IntelliJ IDEA就可以了，每道题都可以单独运行，已经带了一部分常见的测试用例

另外如果你也用IDEA刷题的话，推荐一下这个插件 ，非常好用

我的习惯配置如下：

PS：插件查看题目会连tag一起展示出来，这其实是个不小的提示，可以考虑不用这个插件功能

关于TempFilePath，对于我的包com.oddcc.leetcode.editor.cn来说，路径应该是/Users/oddcc/Documents/Study/LeetCode/leetcode-practice/src/main/java/com/oddcc，即从leetcode开始，后面是插件默认的包结构。这里应该根据个人需要进行修改

CodeFileName： $!velocityTool.camelCaseName(${question.title})

CodeTemplate：

// ${question.frontendQuestionId}&&${question.titleSlug}

package com.oddcc.leetcode.editor.cn;
public class $!velocityTool.camelCaseName(${question.title}) {
    public static void main(String[] args) {
        Solution solution = new $!velocityTool.camelCaseName(${question.title})().new Solution();
    }
    ${question.code}
}

PS：

推荐一些工具，方便做题的时候理解

图相关：

1. graph_editor ， 可以根据“边”来构造图，有向图无向图都可以，在测试用例太大，你自己画不出来的时候可以用这个，方便找问题
2. graphonline.ru ，除了手画之外，构造图不是很方便，但内置了多种算法演示，如果你能把图画出来，在上面演示非常方便，不理解算法中某一步的时候用

目前已有428道题，不断添加中…

ID	标题	难度	CODE
2	Add Two Numbers	⭐⭐	click
3	Longest Substring Without Repeating Characters	⭐⭐	click
5	Longest Palindromic Substring	⭐⭐	click
6	Zigzag Conversion	⭐⭐	click
7	Reverse Integer	⭐⭐	click
8	String to Integer (atoi)	⭐⭐	click
12	Integer to Roman	⭐⭐	click
13	Roman to Integer	⭐	click
15	3Sum	⭐⭐	click
17	Letter Combinations of a Phone Number	⭐⭐	click
18	4Sum	⭐⭐	click
19	Remove Nth Node From End of List	⭐⭐	click
21	Merge Two Sorted Lists	⭐	click
22	Generate Parentheses	⭐⭐	click
24	Swap Nodes in Pairs	⭐⭐	click
26	Remove Duplicates from Sorted Array	⭐	click
27	Remove Element	⭐	click
28	Find the Index of the First Occurrence in a String	⭐	click
30	Substring with Concatenation of All Words	⭐⭐⭐	click
31	Next Permutation	⭐⭐	click
33	Search in Rotated Sorted Array	⭐⭐	click
34	Find First and Last Position of Element in Sorted Array	⭐⭐	click
35	Search Insert Position	⭐	click
36	Valid Sudoku	⭐⭐	click
38	Count and Say	⭐⭐	click
39	Combination Sum	⭐⭐	click
40	Combination Sum II	⭐⭐	click
41	First Missing Positive	⭐⭐⭐	click
42	Trapping Rain Water	⭐⭐⭐	click
45	Jump Game II	⭐⭐	click
46	Permutations	⭐⭐	click
48	Rotate Image	⭐⭐	click
49	Group Anagrams	⭐⭐	click
53	Maximum Subarray	⭐⭐	click
54	Spiral Matrix	⭐⭐	click
55	Jump Game	⭐⭐	click
56	Merge Intervals	⭐⭐	click
58	Length of Last Word	⭐	click
59	Spiral Matrix II	⭐⭐	click
61	Rotate List	⭐⭐	click
62	Unique Paths	⭐⭐	click
64	Minimum Path Sum	⭐⭐	click
65	Valid Number	⭐⭐⭐	click
66	Plus One	⭐	click
67	Add Binary	⭐	click
68	Text Justification	⭐⭐⭐	click
69	Sqrt(x)	⭐	click
70	Climbing Stairs	⭐	click
71	Simplify Path	⭐⭐	click
73	Set Matrix Zeroes	⭐⭐	click
74	Search a 2D Matrix	⭐⭐	click
75	Sort Colors	⭐⭐	click
78	Subsets	⭐⭐	click
79	Word Search	⭐⭐	click
80	Remove Duplicates from Sorted Array II	⭐⭐	click
81	Search in Rotated Sorted Array II	⭐⭐	click
82	Remove Duplicates from Sorted List II	⭐⭐	click
83	Remove Duplicates from Sorted List	⭐	click
84	Largest Rectangle in Histogram	⭐⭐⭐	click
87	Scramble String	⭐⭐⭐	click
88	Merge Sorted Array	⭐	click
89	Gray Code	⭐⭐	click
90	Subsets II	⭐⭐	click
91	Decode Ways	⭐⭐	click
92	Reverse Linked List II	⭐⭐	click
94	Binary Tree Inorder Traversal	⭐	click
96	Unique Binary Search Trees	⭐⭐	click
97	Interleaving String	⭐⭐	click
98	Validate Binary Search Tree	⭐⭐	click
99	Recover Binary Search Tree	⭐⭐	click
100	Same Tree	⭐	click
101	Symmetric Tree	⭐	click
102	Binary Tree Level Order Traversal	⭐⭐	click
103	Binary Tree Zigzag Level Order Traversal	⭐⭐	click
104	Maximum Depth of Binary Tree	⭐	click
107	Binary Tree Level Order Traversal II	⭐⭐	click
108	Convert Sorted Array to Binary Search Tree	⭐	click
110	Balanced Binary Tree	⭐	click
111	Minimum Depth of Binary Tree	⭐	click
112	Path Sum	⭐	click
113	Path Sum II	⭐⭐	click
114	Flatten Binary Tree to Linked List	⭐⭐	click
115	Distinct Subsequences	⭐⭐⭐	click
116	Populating Next Right Pointers in Each Node	⭐⭐	click
117	Populating Next Right Pointers in Each Node II	⭐⭐	click
118	Pascal's Triangle	⭐	click
119	Pascal's Triangle II	⭐	click
121	Best Time to Buy and Sell Stock	⭐	click
121	Best Time to Buy and Sell Stock	⭐	click
125	Valid Palindrome	⭐	click
127	Word Ladder	⭐⭐⭐	click
129	Sum Root to Leaf Numbers	⭐⭐	click
131	Palindrome Partitioning	⭐⭐	click
132	Palindrome Partitioning II	⭐⭐⭐	click
134	Gas Station	⭐⭐	click
135	Candy	⭐⭐⭐	click
136	Single Number	⭐	click
137	Single Number II	⭐⭐	click
138	Copy List with Random Pointer	⭐⭐	click
139	Word Break	⭐⭐	click
141	Linked List Cycle	⭐	click
142	Linked List Cycle II	⭐⭐	click
143	Reorder List	⭐⭐	click
144	Binary Tree Preorder Traversal	⭐	click
145	Binary Tree Postorder Traversal	⭐	click
146	LRU Cache	⭐⭐	click
147	Insertion Sort List	⭐⭐	click
148	Sort List	⭐⭐	click
150	Evaluate Reverse Polish Notation	⭐⭐	click
152	Maximum Product Subarray	⭐⭐	click
153	Find Minimum in Rotated Sorted Array	⭐⭐	click
154	Find Minimum in Rotated Sorted Array II	⭐⭐⭐	click
160	Intersection of Two Linked Lists	⭐	click
164	Maximum Gap	⭐⭐	click
167	Two Sum II - Input Array Is Sorted	⭐⭐	click
168	Excel Sheet Column Title	⭐	click
169	Majority Element	⭐	click
171	Excel Sheet Column Number	⭐	click
172	Factorial Trailing Zeroes	⭐⭐	click
173	Binary Search Tree Iterator	⭐⭐	click
179	Largest Number	⭐⭐	click
189	Rotate Array	⭐⭐	click
190	Reverse Bits	⭐	click
191	Number of 1 Bits	⭐	click
198	House Robber	⭐⭐	click
200	Number of Islands	⭐⭐	click
202	Happy Number	⭐	click
203	Remove Linked List Elements	⭐	click
204	Count Primes	⭐⭐	click
205	Isomorphic Strings	⭐	click
207	Course Schedule	⭐⭐	click
208	Implement Trie (Prefix Tree)	⭐⭐	click
209	Minimum Size Subarray Sum	⭐⭐	click
213	House Robber II	⭐⭐	click
215	Kth Largest Element in an Array	⭐⭐	click
217	Contains Duplicate	⭐	click
219	Contains Duplicate II	⭐	click
220	Contains Duplicate III	⭐⭐⭐	click
221	Maximal Square	⭐⭐	click
222	Count Complete Tree Nodes	⭐	click
224	Basic Calculator	⭐⭐⭐	click
225	Implement Stack using Queues	⭐	click
226	Invert Binary Tree	⭐	click
227	Basic Calculator II	⭐⭐	click
228	Summary Ranges	⭐	click
231	Power of Two	⭐	click
232	Implement Queue using Stacks	⭐	click
234	Palindrome Linked List	⭐	click
235	Lowest Common Ancestor of a Binary Search Tree	⭐⭐	click
236	Lowest Common Ancestor of a Binary Tree	⭐⭐	click
237	Delete Node in a Linked List	⭐⭐	click
238	Product of Array Except Self	⭐⭐	click
240	Search a 2D Matrix II	⭐⭐	click
242	Valid Anagram	⭐	click
257	Binary Tree Paths	⭐	click
263	Ugly Number	⭐	click
264	Ugly Number II	⭐⭐	click
268	Missing Number	⭐	click
278	First Bad Version	⭐	click
279	Perfect Squares	⭐⭐	click
283	Move Zeroes	⭐	click
287	Find the Duplicate Number	⭐⭐	click
290	Word Pattern	⭐	click
300	Longest Increasing Subsequence	⭐⭐	click
303	Range Sum Query - Immutable	⭐	click
304	Range Sum Query 2D - Immutable	⭐⭐	click
309	Best Time to Buy and Sell Stock with Cooldown	⭐⭐	click
316	Remove Duplicate Letters	⭐⭐	click
322	Coin Change	⭐⭐	click
328	Odd Even Linked List	⭐⭐	click
331	Verify Preorder Serialization of a Binary Tree	⭐⭐	click
337	House Robber III	⭐⭐	click
338	Counting Bits	⭐	click
341	Flatten Nested List Iterator	⭐⭐	click
342	Power of Four	⭐	click
343	Integer Break	⭐⭐	click
344	Reverse String	⭐	click
347	Top K Frequent Elements	⭐⭐	click
349	Intersection of Two Arrays	⭐	click
350	Intersection of Two Arrays II	⭐	click
354	Russian Doll Envelopes	⭐⭐⭐	click
363	Max Sum of Rectangle No Larger Than K	⭐⭐⭐	click
368	Largest Divisible Subset	⭐⭐	click
377	Combination Sum IV	⭐⭐	click
387	First Unique Character in a String	⭐	click
394	Decode String	⭐⭐	click
395	Longest Substring with At Least K Repeating Characters	⭐⭐	click
396	Rotate Function	⭐⭐	click
398	Random Pick Index	⭐⭐	click
399	Evaluate Division	⭐⭐	click
401	Binary Watch	⭐	click
403	Frog Jump	⭐⭐⭐	click
406	Queue Reconstruction by Height	⭐⭐	click
409	Longest Palindrome	⭐	click
415	Add Strings	⭐	click
416	Partition Equal Subset Sum	⭐⭐	click
421	Maximum XOR of Two Numbers in an Array	⭐⭐	click
424	Longest Repeating Character Replacement	⭐⭐	click
430	Flatten a Multilevel Doubly Linked List	⭐⭐	click
435	Non-overlapping Intervals	⭐⭐	click
437	Path Sum III	⭐⭐	click
438	Find All Anagrams in a String	⭐⭐	click
448	Find All Numbers Disappeared in an Array	⭐	click
451	Sort Characters By Frequency	⭐⭐	click
452	Minimum Number of Arrows to Burst Balloons	⭐⭐	click
454	4Sum II	⭐⭐	click
455	Assign Cookies	⭐	click
456	132 Pattern	⭐⭐	click
461	Hamming Distance	⭐	click
463	Island Perimeter	⭐	click
474	Ones and Zeroes	⭐⭐	click
477	Total Hamming Distance	⭐⭐	click
480	Sliding Window Median	⭐⭐⭐	click
485	Max Consecutive Ones	⭐	click
494	Target Sum	⭐⭐	click
496	Next Greater Element I	⭐	click
502	IPO	⭐⭐⭐	click
503	Next Greater Element II	⭐⭐	click
509	Fibonacci Number	⭐	click
518	Coin Change II	⭐⭐	click
523	Continuous Subarray Sum	⭐⭐	click
525	Contiguous Array	⭐⭐	click
530	Minimum Absolute Difference in BST	⭐	click
538	Convert BST to Greater Tree	⭐⭐	click
543	Diameter of Binary Tree	⭐	click
547	Number of Provinces	⭐⭐	click
554	Brick Wall	⭐⭐	click
560	Subarray Sum Equals K	⭐⭐	click
561	Array Partition	⭐	click
566	Reshape the Matrix	⭐	click
567	Permutation in String	⭐⭐	click
575	Distribute Candies	⭐	click
581	Shortest Unsorted Continuous Subarray	⭐⭐	click
599	Minimum Index Sum of Two Lists	⭐	click
605	Can Place Flowers	⭐	click
606	Construct String from Binary Tree	⭐⭐	click
611	Valid Triangle Number	⭐⭐	click
617	Merge Two Binary Trees	⭐	click
621	Task Scheduler	⭐⭐	click
622	Design Circular Queue	⭐⭐	click
623	Add One Row to Tree	⭐⭐	click
628	Maximum Product of Three Numbers	⭐	click
633	Sum of Square Numbers	⭐⭐	click
636	Exclusive Time of Functions	⭐⭐	click
639	Decode Ways II	⭐⭐⭐	click
640	Solve the Equation	⭐⭐	click
643	Maximum Average Subarray I	⭐	click
645	Set Mismatch	⭐	click
646	Maximum Length of Pair Chain	⭐⭐	click
647	Palindromic Substrings	⭐⭐	click
652	Find Duplicate Subtrees	⭐⭐	click
664	Strange Printer	⭐⭐⭐	click
665	Non-decreasing Array	⭐⭐	click
674	Longest Continuous Increasing Subsequence	⭐	click
680	Valid Palindrome II	⭐	click
684	Redundant Connection	⭐⭐	click
687	Longest Univalue Path	⭐⭐	click
690	Employee Importance	⭐⭐	click
692	Top K Frequent Words	⭐⭐	click
695	Max Area of Island	⭐⭐	click
697	Degree of an Array	⭐	click
701	Insert into a Binary Search Tree	⭐⭐	click
703	Kth Largest Element in a Stream	⭐	click
704	Binary Search	⭐	click
705	Design HashSet	⭐	click
706	Design HashMap	⭐	click
709	To Lower Case	⭐	click
713	Subarray Product Less Than K	⭐⭐	click
714	Best Time to Buy and Sell Stock with Transaction Fee	⭐⭐	click
718	Maximum Length of Repeated Subarray	⭐⭐	click
721	Accounts Merge	⭐⭐	click
724	Find Pivot Index	⭐	click
738	Monotone Increasing Digits	⭐⭐	click
739	Daily Temperatures	⭐⭐	click
740	Delete and Earn	⭐⭐	click
746	Min Cost Climbing Stairs	⭐	click
752	Open the Lock	⭐⭐	click
763	Partition Labels	⭐⭐	click
765	Couples Holding Hands	⭐⭐⭐	click
766	Toeplitz Matrix	⭐	click
767	Reorganize String	⭐⭐	click
771	Jewels and Stones	⭐	click
781	Rabbits in Forest	⭐⭐	click
783	Minimum Distance Between BST Nodes	⭐	click
817	Linked List Components	⭐⭐	click
830	Positions of Large Groups	⭐	click
832	Flipping an Image	⭐	click
844	Backspace String Compare	⭐	click
845	Longest Mountain in Array	⭐⭐	click
852	Peak Index in a Mountain Array	⭐⭐	click
856	Score of Parentheses	⭐⭐	click
860	Lemonade Change	⭐	click
867	Transpose Matrix	⭐	click
868	Binary Gap	⭐	click
872	Leaf-Similar Trees	⭐	click
877	Stone Game	⭐⭐	click
883	Projection Area of 3D Shapes	⭐	click
888	Fair Candy Swap	⭐	click
896	Monotonic Array	⭐	click
897	Increasing Order Search Tree	⭐	click
899	Orderly Queue	⭐⭐⭐	click
918	Maximum Sum Circular Subarray	⭐⭐	click
922	Sort Array By Parity II	⭐	click
923	3Sum With Multiplicity	⭐⭐	click
925	Long Pressed Name	⭐	click
930	Binary Subarrays With Sum	⭐⭐	click
938	Range Sum of BST	⭐	click
941	Valid Mountain Array	⭐	click
951	Flip Equivalent Binary Trees	⭐⭐	click
959	Regions Cut By Slashes	⭐⭐	click
973	K Closest Points to Origin	⭐⭐	click
977	Squares of a Sorted Array	⭐	click
978	Longest Turbulent Subarray	⭐⭐	click
981	Time Based Key-Value Store	⭐⭐	click
989	Add to Array-Form of Integer	⭐	click
992	Subarrays with K Different Integers	⭐⭐⭐	click
993	Cousins in Binary Tree	⭐	click
995	Minimum Number of K Consecutive Bit Flips	⭐⭐⭐	click
1002	Find Common Characters	⭐	click
1004	Max Consecutive Ones III	⭐⭐	click
1006	Clumsy Factorial	⭐⭐	click
1011	Capacity To Ship Packages Within D Days	⭐⭐	click
1018	Binary Prefix Divisible By 5	⭐	click
1030	Matrix Cells in Distance Order	⭐	click
1035	Uncrossed Lines	⭐⭐	click
1046	Last Stone Weight	⭐	click
1047	Remove All Adjacent Duplicates In String	⭐	click
1049	Last Stone Weight II	⭐⭐	click
1052	Grumpy Bookstore Owner	⭐⭐	click
1074	Number of Submatrices That Sum to Target	⭐⭐⭐	click
1122	Relative Sort Array	⭐	click
1128	Number of Equivalent Domino Pairs	⭐	click
1137	N-th Tribonacci Number	⭐	click
1143	Longest Common Subsequence	⭐⭐	click
1178	Number of Valid Words for Each Puzzle	⭐⭐⭐	click
1190	Reverse Substrings Between Each Pair of Parentheses	⭐⭐	click
1202	Smallest String With Swaps	⭐⭐	click
1207	Unique Number of Occurrences	⭐	click
1208	Get Equal Substrings Within Budget	⭐⭐	click
1221	Split a String in Balanced Strings	⭐	click
1232	Check If It Is a Straight Line	⭐	click
1239	Maximum Length of a Concatenated String with Unique Characters	⭐⭐	click
1269	Number of Ways to Stay in the Same Place After Some Steps	⭐⭐⭐	click
1277	Count Square Submatrices with All Ones	⭐⭐	click
1310	XOR Queries of a Subarray	⭐⭐	click
1356	Sort Integers by The Number of 1 Bits	⭐	click
1365	How Many Numbers Are Smaller Than the Current Number	⭐	click
1370	Increasing Decreasing String	⭐	click
1403	Minimum Subsequence in Non-Increasing Order	⭐	click
1408	String Matching in an Array	⭐	click
1413	Minimum Value to Get Positive Step by Step Sum	⭐	click
1417	Reformat The String	⭐	click
1418	Display Table of Food Orders in a Restaurant	⭐⭐	click
1423	Maximum Points You Can Obtain from Cards	⭐⭐	click
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	⭐⭐	click
1442	Count Triplets That Can Form Two Arrays of Equal XOR	⭐⭐	click
1473	Paint House III	⭐⭐⭐	click
1475	Final Prices With a Special Discount in a Shop	⭐	click
1482	Minimum Number of Days to Make m Bouquets	⭐⭐	click
1486	XOR Operation in an Array	⭐	click
1582	Special Positions in a Binary Matrix	⭐	click
1592	Rearrange Spaces Between Words	⭐	click
1600	Throne Inheritance	⭐⭐	click
1603	Design Parking System	⭐	click
1614	Maximum Nesting Depth of the Parentheses	⭐	click
1629	Slowest Key	⭐	click
1631	Path With Minimum Effort	⭐⭐	click
1694	Reformat Phone Number	⭐	click
1707	Maximum XOR With an Element From Array	⭐⭐⭐	click
1711	Count Good Meals	⭐⭐	click
1720	Decode XORed Array	⭐	click
1723	Find Minimum Time to Finish All Jobs	⭐⭐⭐	click
1734	Decode XORed Permutation	⭐⭐	click
1736	Latest Time by Replacing Hidden Digits	⭐	click
1738	Find Kth Largest XOR Coordinate Value	⭐⭐	click
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	⭐⭐	click
1758	Minimum Changes To Make Alternating Binary String	⭐	click
1780	Check if Number is a Sum of Powers of Three	⭐⭐	click
1781	Sum of Beauty of All Substrings	⭐⭐	click
1790	Check if One String Swap Can Make Strings Equal	⭐	click
1800	Maximum Ascending Subarray Sum	⭐	click
1822	Sign of the Product of an Array	⭐	click
1823	Find the Winner of the Circular Game	⭐⭐	click
1827	Minimum Operations to Make the Array Increasing	⭐	click
1832	Check if the Sentence Is Pangram	⭐	click
1833	Maximum Ice Cream Bars	⭐⭐	click
1877	Minimize Maximum Pair Sum in Array	⭐⭐	click
1893	Check if All the Integers in a Range Are Covered	⭐	click
1894	Find the Student that Will Replace the Chalk	⭐⭐	click
2038	Remove Colored Pieces if Both Neighbors are the Same Color	⭐⭐	click
2043	Simple Bank System	⭐⭐	click
2044	Count Number of Maximum Bitwise-OR Subsets	⭐⭐	click
LCP 07	传递信息	⭐	click
LCR 007	三数之和	⭐⭐	click
LCR 120	寻找文件副本	⭐	click
LCR 121	寻找目标值 - 二维数组	⭐⭐	click
LCR 122	路径加密	⭐	click
LCR 123	图书整理 I	⭐	click
LCR 124	推理二叉树	⭐⭐	click
LCR 125	图书整理 II	⭐	click
LCR 126	斐波那契数	⭐	click
LCR 127	跳跃训练	⭐	click
LCR 128	库存管理 I	⭐	click
LCR 129	字母迷宫	⭐⭐	click
LCR 130	衣橱整理	⭐⭐	click
LCR 131	砍竹子 I	⭐⭐	click
LCR 132	砍竹子 II	⭐⭐	click
LCR 133	位 1 的个数	⭐	click
LCR 135	报数	⭐	click
LCR 136	删除链表的节点	⭐	click
LCR 139	训练计划 I	⭐	click
LCR 140	训练计划 II	⭐	click
LCR 141	训练计划 III	⭐	click
LCR 156	序列化与反序列化二叉树	⭐⭐⭐	click
LCR 157	套餐内商品的排列顺序	⭐⭐	click
LCR 161	连续天数的最高销售额	⭐	click
LCR 171	训练计划 V	⭐	click
LCR 172	统计目标成绩的出现次数	⭐	click
面试题 01.01	Is Unique LCCI	⭐	click
面试题 01.02	Check Permutation LCCI	⭐	click
面试题 01.03	String to URL LCCI	⭐	click
面试题 01.04	Palindrome Permutation LCCI	⭐	click
面试题 01.05	One Away LCCI	⭐⭐	click
面试题 01.06	Compress String LCCI	⭐	click
面试题 01.08	Zero Matrix LCCI	⭐⭐	click
面试题 01.09	String Rotation LCCI	⭐	click
面试题 17.10	Find Majority Element LCCI	⭐	click
面试题 17.21	Volume of Histogram LCCI	⭐⭐⭐	click