View Compilation Error

0_0_38905361_3364.cpp: In function 'bool solve()':
0_0_38905361_3364.cpp:59:24: error: cannot convert 'std::basic_istream<char>' to 'bool' in initialization
   59 |         bool ok = (cin >> s);
      |                   ~~~~~^~~~~
      |                        |
      |                        std::basic_istream<char>