Joseph recently received some strings as his birthday gift from Chris. He is interested in the similarity between those strings. He thinks that two strings a and b are considered J-similar to each other in one of these two cases: 1. a is equal to b. 2. he can cut a into two substrings a1; a2 of the same length, and cut b in the same way, then one of following is correct: (a) a1 is J-similar to b1, and a2 is J-similar to b2. (b) a2 is J-similar to b1, and a1 is J-similar to b2. Caution: the second case is not applied to strings of odd length. He ask you to help him sort this out. Please prove that only strings having the same length can be J-similar to each other, then design an algorithm to determine if two strings are J-similar within O(nlogn) time (where n is the length of strings).

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You should always remember that sql is pretty useless to learn about since most sites aren't vulnrable to sql anymore. thedatabase management of an sql database is done with php the actual database is a sql database, but websites interact with databases using php. php coukd mean the site is vulnerable to sqli, but that is only an issue if proper measures aren't put into place, it can be. you don't need php in the url for it to be php it's the code that runs the actual site,it manages databases, actions etc. php runs the whole backend of a site. you could try to put an apostrophe in the url or password input to see if there is an error. if the domain name isnt vulnerable to sqli, that means every file path of the domain probably isn't vulnerable because they are aware of sqli. you should also see what fourm script the site is running. for example, if they are running mybb, there could be a vuln in mybb itself or one of the plugins it uses. another thing you should be able to do is identify if a site even uses sql. for example, a site like roblox may use sql because it has accounts and inorder to have accounts php is used. another way would be to look and see if the site has for example id=1 add a ' after it. if the site is vulnerable you'll see a sql error. but no one cares about sqli it is pretty much dead so telling you this is pointless.