View Compilation Error

0_0_33858252_3437.cpp: In function 'std::string solve(const string&, int, int)':
0_0_33858252_3437.cpp:46:32: error: expected '}' at end of input
             clas.push_back(' ');//
                                ^
0_0_33858252_3437.cpp:46:32: error: expected '}' at end of input
0_0_33858252_3437.cpp:46:32: error: expected '}' at end of input