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<...
when I was looking at the layout of other people s blogs, I found an interesting problem. Its sidebar was positioned with position:fixed, but it did not set the values of top and left. At this time, it was not positioned relative to the viewport, but r...
1. var a = 1; var b = a; a = 2; console.log(b); 1 var c = [1,2,3]; var d = c; c.shift(); console.log(d); [2,3] We know that the assignment of the basic object is a copy value, so changing a does not affect b, while the complex object assignment...
set scheduled tasks on ubuntu18.04 and execute the PHP file ds.php . Contents of PHP file: <?php file_put_contents(__DIR__. ds.txt ,date( Y-m-d H:i:s )); $mysqli = new mysqli( 127.0.0.1 , root , 123456 , mydb ); if($mysq...
the platform on which the problem occurs win10 1703 | Visual Studio Community 2017 15.7.4 27703.2035 | .NET Framework 4.7.03056 | CSC 2.8.3-beta6-62923-07 related codes void RemoveFilesListItems(object sender, RoutedEventArgs e) { FilesList...
problem description is going to crawl the penalty information of several listed companies on the Shenzhen Stock Exchange website in a multi-process way at the same time, but the code is only executed on one of the listed company names, which is very c...