I frequently saw connection has TIME_WAIT status, for ex: 12345????netstat -ant|awk '/^tcp/ {++S[$NF]} END {for(a in S) print (a,S[a])}'LISTEN 35CLOSE...

there are 3 pits when we use channel. deadlock panic oom deadlock12345678910// 只有生产者，没有消费者func f1() { ch := make(chan int) ch <- 1}func main() { f1()} we w...

leetcode 1428solution 1, traverseruntime 221ms, 9% 12345678910111213def leftMostColumnWithOne(self, binaryMatrix: 'BinaryMatrix') -> int: rows, cols = binaryMatrix...

keyword iota is used on const enum, it defines the auto-incremental counter starting from 0for ex 123456789const ( Sunday = iota // starting from 0 Monday // 1 Tuesday...

try with pipenvwebssh pipenv install virtualenv12345678910111213141516171819202122232425262728293031323334353637鉂??pipenv --python 3.8.9Creating a virtualenv for this project...Pip...

last time I come to this site is 2019, 3 years passed. I need to come here more often and write more. let’s see.

Analysis of an implementation of zookeeper distributed lockreferencelink the mechanism of zookeeper distributed locklet’s assume there are two clients try to get the zk’s lockas we...

select null exampleI saw a sql code snippet as this: 123456789101112131415161718192021222324252627 select * from ( select v.empno,v.ename,v.job,v.mgr,v.hiredate, v.sal,...

leetcode workd break II with scala solutiontop-down DP1234567891011121314151617181920212223242526272829303132def wordBreak(s: String, wordDict: List[String]): List[String] = {...

Definition of foldLeft and foldRightfoldLeft please notice the definition of op : (op: (B, A) => B) here, A is the element of the caller, B is the intermedia result of function...