ARTS-WEEK-016
Algorithm:
129: Sum Root to Leaf Numbers
463: Island Perimeter
都比较容易,注意第一题递归终止条件中只有当前节点是叶子结点才需要累加,避免重复计算。
Review:
Fixing Linux filesystem performance regressions
来自linkedin技术博客的一篇文章,讲述他们在实施生产集群机器重镜像过程中遇到的一个EXT4文件系统性能问题bug的过程,从问题发生、定位、解决、经验都有涉及,并且也有一些关于文件系统相关知识,很多陌生的内容,值得学习。
Tip:
我常用的VIM快捷键整理
"_p | |
---|---|
"0p | |
:sort i | |
:reg | show registers content |
"xy | yank into register x |
"xp | paste contents of register x |
:v/regex/d | 只保留有匹配的行 |
:set wrap! | toggle wrap |
:set cul! | toggle cursor line |
:set cuc! | toggle cursor column |
`` | switch cursor |
ctrl+O | back cursor |
ctrl+I | forward cursor |
sp、vsp | split view |
ctrl + s/v | split view key |
ctrl w w | toggle window |
ctrl w h/j/k/l | toggle window next/pre |
ctrl w n/c/q | window new/close/quit |
ctrl w =/_/| | window resize/x height/x width |
zz/zt/zb | center/top/bottom cusor in the screen |
H、L、M | move cusor to top、bottom、middle |
ctrl + e | move screen down |
ctrl + y | move screen up |
ctrl + f / b / d/ u | page up / down /half |
:noh | |
:set rnu/nornu | |
% | match parenthesis or bracket, everywhere |
:%s/old/new/g | change in whole file(without g, only the first of every line) |
😒/old/new/g | change in a line(without g, only the first) |
:#,#s/old/new/gc | betweent the two lines, with c means confirmation |
:.,$s/old/new/g | substitute from current line to file end |
:.,+8s/old/new/g | substitute to next 8 line |
:/FROM/,/TO/s/old/new/g | substitute betweent FROM and TO |
shift+v & 😒 | substitute in select lines |
/ and ? | search forward or backward |
:w fileName then :!pwd/ls/rm | |
:#,# w fileName | write part |
:r fileName | retrieve and merge |
r or R | R replace more |
gv | last visual selection |
o | when selection,toggle pos |
ctrl + n/p | auto complete |
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学习如何有效决策 - 《原则》 - RAY DALIO
重点:
- 影响好决策的最重大的威胁是有害的情绪
- 决策是一个两步流程,先了解后决定,先把了解做好
- 综合分析眼前的形势,包括可信的人、区分观点和事实、避免眼前的夸大、避免过度细节。
- 综合分析变化中的形势,包括关注改善的速度和水平、粗略预估、关键性因素。
- 综合考虑各个层次,定位问题所在的层次,在合理的层次决策。
- 基于证据、符合逻辑、理性和常识进行决策,更具体的关注期望、概率、时机、顺序(先做必做之事和重要之事)等。
- 简化、使用原则、记录和评估。