[链接]:CF Examples inputCopy ((?)) outputCopy 4 inputCopy ??()?? outputCopy 7 说明 For the first sample testcase, the pretty substrings of s s are: "(?" which can be transformed to "()". "?)" which can be transformed to "()&…
As Will is stuck in the Upside Down, he can still communicate with his mom, Joyce, through the Christmas lights (he can turn them on and off with his mind). He can't directly tell his mom where he is, because the monster that took him to the Upside D…