why it is wrong?

"An arithmetic expression in D++ is always opened by "(", is closed by ")" and may contain any of the following symbols: "=+-*/0123456789)(""

arithmetic expression is opened by '(',may contain '*'and closed by ')'.so "(*)" can seen as a right  arithmetic expression.

anyone can answer me??

my AC'ed solution says that (*) is NOT a legal expression.
Either the test set does not have such things, or judges do not consider (*) to be an arithmetic expr

(*) is NOT valid!

An arithmetic expression can't start with a pair of symbols "(*"

In my opinion, (*) is valid COMMENTARY - it's opened by (* and closed by *) ; I think we need to add "and these two pairs of symbols should not intersect" to this phrase in statement - " A comment is always opened by a pair of symbols "(*" and is closed by a pair of symbols "*)" , otherwise (*) is YES for sure.

Edited by author 16.02.2010 13:52

You is very crazy man :)
I think, that you never write syntax analyzer for languages.
You "additional condition"  is obvious for all, that ever write syntax analyzers, but not for you. :)
This problem is about syntax analyzer , NOT working with any string and substrings.


Edited by author 16.02.2010 21:12