组队复习算法+刷题

08/14 打卡 (Day 5)
14. Longest Common Prefix
26. Remove Duplicates from Sorted Array

打卡7:
String:
316        Remove Duplicate Letters
168        Excel Sheet Column Title       
171        Excel Sheet Column Number

qugemingzi 发表于 2019-8-13 15:37
打卡6:

进度：

打卡7:

进度：
9.1.3 string builder
interview question 1.3 URLify
review quick sort


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打卡summary：
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大家继续加油👍👍

Day day up!

打卡
1. [468] Validate IP Address
2. [504] Base 7

补充内容 (2019-8-16 10:08):
3 470-Implement Rand10() Using Rand7()

8.15打卡：161. One Edit Distance  => 3 cases + judge len diff == 1 at last
317. Shortest Distance from All buildings   => BFS: for each building accumulate distance between it and every house
632. Smallest Range Covering Elements from K Lists  => Similar to Merge K Lists, keep track of current min range
1099. Two Sum Less Than K   => two pointers

一起一起 加个好友刷题

08/15 打卡 (Day 6)
[27] Remove Element - Easy
[709] To Lower Case - Easy   

8/15 继续DP
198.house-robber.java
276.paint-fence.java

 打卡8:
273. Integer to English Words

08/15 打卡 (Day 1)
200 # of islands - medium
68 Text Justification - hard (本人觉得这道题只要屡清楚逻辑就很简单）
76 Minimum Window Substring - hard (用vector<int> 来画window)

08/16 打卡 (Day 2)
3 Longest Substring Without Repeating Characters - Medium
159 Longest Substring with At Most Two Distinct Characters - Hard
297 Serialize and Deserialize Binary Tree - Hard1 Two Sum - Easy

新知识点
200 用bfs做 bfs记录哪里visit过 (queue)
Elements in a character stream are considered to be separated by 'white space' which is basically space, tab and newline characters。
istringstream ins(data); 可以convert string -> istringstream
out.str() 可以convert ostringstream -> string
unordered_map 支持 m.count(key) (会Searches the container for elements whose key is k and returns the number of elements found） time complexity: linear