#LeetCode leetCode刷题练习册 sort 文件夹下是几种常见的排序方法 顺序是从ar率高->低

#	Problem	Level	Language	des
0	1-Two Sum	easy	Java
1	2-Add Two Numbers	Medium	Java
2	7-Reverse Integer	easy	Java
3	9-Palindrome Number	easy	Java
4	14-Longest Common Prefix	easy	Java
5	461-Hamming Distance	easy	Java
6	476-Number Complement	easy	Java
7	535-Encode and Decode TinyURL	Medium	Java	非常取巧的办法 并不推荐
8	537Complex Number Multiplication	Medium	Java
9	561-Array Partition I	easy	Java	split效率比indexOf+substring效率低
10	595-Big Countries	easy	MySQL
11	617-Merge Two Binary Trees	easy	Java
12	627-Swap Salary	easy	MySQL
13	654-Maximum Binary Tree	Medium	Java
14	657-Judge Route Circle	Easy	Java
15	728-Self Dividing Numbers	Easy	Java
16	760-Find Anagram Mappings	Medium	Java
17	344-Reverse String	Easy	Java
18	557- Reverse Words in a String III	Easy	Java
19	500-Keyboard Row	Easy	Kotlin	kotlin 效率有点低
20	620-Not Boring Movies	Easy	MySQL
21	771-Jewels and Stones	Easy	kotlin	kotlin 效率真的低 可能是leetCode网站的BUG？？？
22	682-Baseball Game	Easy	kotlin	实锤 leetcode kotlin环境有问题 stack版本居然通不过编译 可能是版本较低
23	412-Fizz Buzz	Easy	java	递归会stackoverflow
24	575-Distribute Candies	Easy	java
25	338-Counting Bits	Medium	java	这个方法确实骚
26	566-Reshape the Matrix	Easy	java
27	766-Toeplitz Matrix	Easy	java
28	763-Partition Labels	Medium	java
29	762-Prime Number of Set Bits in Binary Representation	Easy	java
30	496-Next Greater Element I	Easy	java
31	406-Queue Reconstruction by Height	Medium	java
32	665-Non-decreasing Array	easy	java
33	463-Island Perimeter	Easy	java
32	419-Battleships in a Board	Easy	java
33	442-Find All Duplicates in an Array	Medium	java	好题 想了很久 重点是要符合时间复杂度O(n)和阅读题干条件
34	540- Single Element in a Sorted Array	Medium	java	这是我见过最简单的Medium
35	513- Find Bottom Left Tree Value	Easy	java
36	521- Longest Uncommon Subsequence I	Easy	java	这题的难度在于阅读题干 —_— 亮点在于评论区
37	693- Binary Number with Alternating Bits	Easy	java
38	136- Single Number	Easy	java
39	553- Optimal Division	Medium	java	要做到被除数最大 除数最小 脑筋急转弯
40	647- Palindromic Substrings	Medium	java
41	112- Path Sum	Easy	java
42	144- Binary Tree Preorder Traversal	Medium	java
43	145- Binary Tree Postorder Traversal	Head	java
44	94- Binary Tree Inorder Traversal	Medium	java
45	102- Binary Tree Level Order Traversal	Medium	java
46	104- Maximum Depth of Binary Tree	Easy	java
47	101- Symmetric Tree	Easy	java
48	105- Construct Binary Tree from Preorder and Inorder Traversal	Medium	java
49	106- Construct Binary Tree from Inorder and Postorder Traversal	Medium	java
50	116- Populating Next Right Pointers in Each Node	Medium	java
51	206- Reverse Linked List	Medium	java
52	278- First Bad Version	Easy	java
53	796- Rotate String	Easy	java	so cooooool
54	961- N-Repeated Element in Size 2N Array	Easy	java
55	929- Unique Email Addresses	Easy	java
56	70- Climbing Stairs	Easy	java	面试时被问到了 懵了 居然写了个蠢B的递归 心疼自己
57	121- Best Time to Buy and Sell Stock	Easy	java	只交易一次 取差值最大就完事了
58	122- Best Time to Buy and Sell Stock II	Easy	java	可交易2次 利润最大化
59	123- Best Time to Buy and Sell Stock III	Easy	java	可交易多次 利润最大化
60	124- Best Time to Buy and Sell Stock IV	Easy	java	可交易多次 利润最大化
61	173- Binary Search Tree Iterator	Easy	Medium
62	98- Validate Binary Search Tree	Easy	java
63	700- Search in a Binary Search Tree	Easy	java
64	701- Insert into a Binary Search Tree	Medium	java
65	450- Delete Node in a BST	Medium	java
66	509- Fibonacci Number	Easy	java
67	724- Find Pivot Index	Easy	java
68	703- Kth Largest Element in a Stream	Easy	java
69	124- K-th Symbol in Grammar	Easy	java
70	747- Largest Number At Least Twice of Others	Easy	java
71	235- Lowest Common Ancestor of a Binary Search Tree	Easy	java
72	747-Merge Two Sorted Lists	Easy	java
73	236- Lowest Common Ancestor of a Binary Tree	Easy	java
74	704- Binary Search	Easy	java
75	8-String to Integer (atoi)	Medium	java
76	3- Longest Substring Without Repeating Characters	Medium	java
77	4- Median of Two Sorted Arrays	Hard	java
78	867- Transpose Matrix	Easy	java
79	31- Next Permutation	Medium	java
80	5. Longest Palindromic Substring		Medium	java