PEAR2020

摘要： variable & const eclipse keymap alt + -> = step into alt + <- = step out ctrl + d = delete a := 1 cannot be used to declare global variable one packag 阅读全文

摘要： go 路径问题: go install 下载到$GOPATH/bin 下生成exe，$GOPATH/bkg下载包 cd 到目标文件目录，go install， cd $GOPATH/bin ./main.exe go get 对比 go install: https://juejin.cn/post 阅读全文

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摘要： example to explain how to calculate Time Complexity the memo size means each state will be calculated only once how about the TC in each state? class 阅读全文

摘要： 1. Boyer-Moore Voting Algorithm identify the majority element (frequency > n/2) class Solution { public int majorityElement(int[] nums) { int count = 阅读全文

摘要： 1. return it modulo 10^9 + 7 to prevent large result: => int mod = 1_000_000_007; then result %= mod 2. Top-down memorization: memo几维一般看dfs()里面有几个变量+1 阅读全文

摘要： 1. 一般可以用简易版： Arrays.sort(lst, (a,b) -> a[0]-b[0]); 但是在遇到a，b是large numbers时候遇到困难，改成： Arrays.sort(points,(o1,o2)->{ if(o1[1] == o2[1]) return 0; if(o1[1 阅读全文

摘要： https://blog.developer.atlassian.com/10-design-principles-for-delightful-clis/ 阅读全文

摘要： 1. Intro to Flask 1.1 Simplest Demo 1.1.1 install virtual environment to separate package cd a new folder # see existing packages pip list # venv modu 阅读全文

摘要： 1. Requirement chyper-code.xlsx 2. Implementation 2.1 custom encoding read from excel rename columns uniform type data in excel => dict how to elegant 阅读全文