Algorithm
LeetCode题库
Review
1. C++中的using namespace std
分享链接：StackOverflow: Why is “using namespace std;” considered bad practice?
这个帖子的问答内容，详细解释了using namespace std;存在的问题及避免使用的原因。最终的结论是：不应该在头文件中使用，而建议在cpp实现文件中使用。
Tip
1. 显示dd命令的读写进度
分享链接：Linux dd Command Show Progress Copy Bar With Status
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dd if=/path/to/input of=/path/to/output status=progress
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2. PGP的使用，对下载文件的校验
分享链接：UNIX / Linux PGP TarBall File Signature Keys Verification
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# 下载文件
$ wget http://nginx.org/download/nginx-1.18.0.tar.gz
$ wget https://nginx.org/download/nginx-1.18.0.tar.gz.asc
# 校验
$ gpg nginx-1.18.0.tar.gz.asc
## OR ##
$ gpg --with-fingerprint nginx-1.18.0.tar.gz.asc
gpg: WARNING: no command supplied. Trying to guess what you mean ...
gpg: assuming signed data in 'nginx-1.18.0.tar.gz'
gpg: Signature made Tuesday 21 April 2020 07:43:35 PM IST
gpg: using RSA key 520A9993A1C052F8
gpg: Can't check signature: No public key
# 获取公钥
gpg --recv-key <publicKey>
## we can also get keys from speifici key server ##
gpg --keyserver pgpkeys.mit.edu --recv-key <publicKey>
# 校验
$ gpg --verify nginx-1.18.0.tar.gz.asc nginx-1.18.0.tar.gz
# 获取公钥
$ wget https://nginx.org/keys/mdounin.key
$ gpg --import mdounin.key
gpg: key 520A9993A1C052F8: 2 signatures not checked due to missing keys
gpg: key 520A9993A1C052F8: public key "Maxim Dounin <mdounin@mdounin.ru>" imported
gpg: Total number processed: 1
gpg: imported: 1
gpg: marginals needed: 3 completes needed: 1 trust model: pgp
gpg: depth: 0 valid: 1 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 1u
$ gpg --verify nginx-1.18.0.tar.gz.asc nginx-1.18.0.tar.gz
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1. 关于R语言的电子书
分享链接：Getting used to R, RStudio, and R Markdown
对应GitHub：https://github.com/ismayc/rbasics