IP屬地:上海
https://codeforces.com/contest/1550/problem/C[https://codeforces.com/con...
https://codeforces.com/contest/1550/problem/C[https://codeforces.com/con...
由于再做一個(gè)課程大作業(yè),想要實(shí)現(xiàn)一個(gè)web私聊的系統(tǒng),于是去google & baidu 搜索了很多文章來看,但是對(duì)于初入門的我并不是很了解其體...