/in/foo.cc: In function 'void solve(std::__cxx11::string&)':
/in/foo.cc:18:17: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
         else if (s[i] == ')')
                 ^
/in/foo.cc:32:39: error: 'reverse' was not declared in this scope
         reverse(ord.begin(), ord.end());
                                       ^