头铁坚持，转行打卡每日刷题

#052720

53. Maximum Subarray
Maximum Subarray II
Maximum Subarray Difference
152. Maximum Product Subarray
Subarray Sum
Subarray Sum Closest
Continuous Subarray Sum
Two Sum
15. 3Sum

#053020

16. 3Sum Closest
18. 4Sum
50. Pow(x, n)
69. Sqrt(x)
172. Factorial Trailing Zeroes
231. Power of Two

复习
k Sum - dp

#053120

Partition Array
Sort Letters by Case
75. Sort Colors
Sort Colors II
Interleaving Positive and Negative Numbers

121道题目的终结！撒花！！！！！！！！！！！！
第一阶段胜利完成，继续加油

开始复习

#060120
78.Subsets
90.Subsets II
46.Permutations 
47.Permutations II 

第一遍复习，几乎等同于重新做，但发现了很多第一次做没有看到的内容，进一步学习。

#060220

17. Letter Combinations of a Phone Number
31. Next Permutation
1053.Previous Permutation With One Swap
39. Combination Sum
40. Combination Sum II
131. Palindrome Partitioning
93. Restore IP Addresses

#060320

34. Find First And Last Position of Element in Sorted Array
35. Search Insert Position
33. Search in Rotated Sorted Array
81. Search in Rotated Sorted Array II
278. First Bad Version
162. Find Peak Element74. Search a 2D Matrix
240. Search a 2D Matrix II
153. Find Minimum in Rotated Sorted Array

#060420

4. Median of Two Sorted Arrays
796. Rotate String
151. Reverse Words in a String
104. Maximum Depth of Binary Tree
98. Validate Binary Search Tree
144. Binary Tree Preorder Traversal

#060520 依旧是复习 Binary tree几乎每个题都有2-4个解法，应该还需要复习巩固

100. Same Tree
110. Balanced Binary Tree
102. Binary Tree Level Order Traversal 
144. Binary Tree Preorder Traversal
145. Binary Tree Postorder Traversal
94. Binary Tree Inorder Traversal

#060620 复习

236. Lowest Common Ancestor of a Binary Tree

#060920 复习（接下来都是复习，所以直到不是复习的时候再特别注明，其余就默认是复习）

124. Binary Tree Maximum Path Sum
103. Binary Tree Zigzag Level Order Traversal
173. Binary Search Tree Iterator
83. Remove Duplicates from Sorted List
82. Remove Duplicates from Sorted List II