arts-week4

Algorithm

1. 867. Transpose Matrix - LeetCode
2. 6. ZigZag Conversion - LeetCode
3. 443. String Compression - LeetCode
4. 189. Rotate Array - LeetCode
5. 846. Hand of Straights - LeetCode
6. 796. Rotate String - LeetCode
7. 278. First Bad Version - LeetCode

Review

并发!=并行

Concurrency != Parallelism

Tip

String和char的相互转换

// String转char
char c = str.charAt(index)
char c = str.toCharArray()

// char转String
String s = String.valueOf('c');
String s = String.valueOf(new char[]{'a', 'b', 'c'});
String s = Character.toString('c');

screen命令

http://man.linuxde.net/screen

# 查看会话列表
screen -ls

# 重新连接会话
screen -r screenId

# 清除dead会话
screen -wipe

# 进后台
<C-a> d

# 关窗口杀进程 先按Ctrl+a 再按k
<C-a> k

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行为参数化与lambda表达式 - 读《Java 8实战》