topic description Mathematical Combinatorial problems sources of topics and their own ideas competitive programs what result do you expect? What is the error message actually seen? I tried a way to solve this problem in O (n). But get the wron...
I did a question on leetcode, but for the string type, the push_back concatenation character failed the test, but changed to the plus sign to concatenate the character and passed it. topic link my two codes: class Solution { public: vector<...
flask project cannot modify access ip and port Windows uses the flask framework to write the simplest case according to the tutorial, the code is as follows. But when I wanted to modify the access to ip, I found that it would not work. According to th...
there is a problem: the token logged in by the user has the path: ; of cookies cut to system A, the token of system A has path: a , cut to system B, and the token of system B has path: B . When I quit in system A, I erased the data in cookies a...
1. Recently, I encountered a strange thing when I configured adsl dialing on linux. When adding vlan to linux, the VLAN Dev name of vlan normally ends with [network card .xx]. As a result, mine ends with [renamexx], which is directly above the figure. ...
the same query, using mongoTemplate will be much slower, using mongodb tool, looking at the execution plan is very fast, the difference is very big ...
my project is written by ts + react + dva, and everything is normal. After there is no bug, to produce the QR code, UC browser, Wechat QQ and other code scanning tools can display the page after scanning the code, but Alipay is not good, the iphone versi...