[第三期活动] 在职刷题打卡，目标工作日一天2题，周末一天5题

09/13
# day 13
636. Exclusive Time of Functions
297. Serialize and Deserialize Binary Tree

09/12
# day 12
236. Lowest Common Ancestor of a Binary Tree
235. Lowest Common Ancestor of a Binary Search Tree

09/11
# day 11
341. Flatten Nested List Iterator
251. Flatten 2D Vector

补几天
09/10
339. Nested List Weight Sum
364. Nested List Weight Sum II565. Array Nesting

Day 4 （9/13）
529，374

#Day_12

Array
Shortest Word Distance
Shortest Word Distance II


补充内容 (2019-9-18 07:51):
# Day_13

#Day_09

398. Random Pick Index
1176. Diet Plan Performance

Stage I : ac即可，不要求最优解，目的：见多识广
day7-09/13-stage I终于结束了，明天开始stage II,买了新的机械键盘，刷题到飞起，根本停不下来……
1. 25. Reverse Nodes in k-Group
2. 128. Longest Consecutive Sequence
3. 19. Remove Nth Node From End of List
4. 223. Rectangle Area
5. 200. Number of Islands
6. 130. Surrounded Regions
7. 41. First Missing Positive
8. 39. Combination Sum
9. 32. Longest Valid Parentheses
10. 20. Valid Parentheses
11. 33. Search in Rotated Sorted Array
12. 153. Find Minimum in Rotated Sorted Array
13. 154. Find Minimum in Rotated Sorted Array II
14. 81. Search in Rotated Sorted Array II
15. 34. Find First and Last Position of Element in Sorted Array
16. 35. Search Insert Position
17. 77. Combinations
18. 46. Permutations
19. 47. Permutations II
20. 31. Next Permutation
21. 40. Combination Sum II
22. 168. Excel Sheet Column Title
23. 58. Length of Last Word
24. 30. Substring with Concatenation of All Words
25. 76. Minimum Window Substring
26. 127. Word Ladder
27.  126. Word Ladder II
28. 151. Reverse Words in a String
29. 152. Maximum Product Subarray
30. 155. Min Stack
31. 160. Intersection of Two Linked Lists
32. 162. Find Peak Element
33. 173. Binary Search Tree Iterator

Day 2
938. Range Sum of BST
1051. Height Checker
461. Hamming Distance
学了一点点位操作，以及bin()的用法

day 11
研究了一晚上Best Time to Buy and Sell Stock IV，都不是很好理解啊= =，大概明白了分阶段的写法，太晚了明天写