[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

请问10月份会还有一期吗

# Day_17

额瑞
Longest Consecutive Sequence
Increasing Triplet Subsequence

#Day 1:

* 905 Sort Array By Parity: 偶数从前往后填，奇数从后往前填
* 1028 Recover a Tree From Preorder Traversal: 用stack始终维护一个path，挺简单的Hard，就是字符串处理有点烦

9/16 复习面筋
224. Basic Calculator
253. Meeting Rooms II
583. Delete Operation for Two Strings
56. Merge Intervals

# Day 0

* 474 Ones and Zeroes: 二维动态规划，建三维表会因为初始化而超时，要建二维表然后逆向更新
* 405 Convert a Number to Hexadecimal: 这题不适合Python因为没有负溢出

Stage II : 分类各个击破
day11-09/17-tree的问题果然不递归的话，就其实也不太简单的，7 in total
greedy
1. 134. Gas Station
2. 238. Product of Array Except Self
3. 135. Candy
binary tree
1. 144. Binary Tree Preorder Traversal
2. 94. Binary Tree Inorder Traversal
3. 145. Binary Tree Postorder Traversal
4. 102. Binary Tree Level Order Traversal

Day_16 (9/16)

Max tree
Trapping rain water

#day 12
15. 3Sum


补充内容 (2019-9-17 23:11):
Maximum Number of Balloons

#Day_10

New:
1057.Campus Bike

Day 07
09/16
2 题
Array Partition I
Two Sum II
上周偷懒了，这周要认真刷题。