[第二期活动] 在职刷题打卡，目标工作日一天2题，周末一天5题

day1
Finished
1. Twitter and Instagram design
2. Find the duplicate number, moving average from data stream, min add to make parentheses valid, valid anagram (四道面经题）

day 2
Stack & Queue CTCI questions
蠡口亚麻5道题

#Day_05

Finished * 1:
746. Min Cost Climbing Stairs

Reviewed * 2:
72. Edit Distance
96. Unique Binary Search Trees

day 4
Word Pattern
Isomorphic Strings
Expression Add Operators 又跑了一遍，修了当输入是 “00” 和 0 时的小bug

day2

Design: twitter search
Algorithm: word ladder II, Remove Invalid Parentheses

今天：
Length of Longest Fibonacci Subsequence: set暴力，或者dp
Basic Calculator 2

Day 3
Tree and Graphs CICT Questions
蠡口亚麻5道题

#Day_06

Finished * 2:
312. Burst Balloons
120. Triangle - 一开始Top2Bottom解的，后来发现Bottom2Top可以省一个Auxiliary Array

最近DP做得有点顺手，再做下去有点逃避其它题目的感觉，明后天换个题型

Day 3
1. 12 & 13 integer & roman conversion
2. 17, dfs

Day 4
1. Lintcode 1639 & Leetcode 340, 76, 159, substring w/ k distinct characters, sliding window

day 5
Word Pattern II 一次通过！
Valid Palindrome 水了一个