Compilare: main.cpp: In member function 'void Tree::getTree(Node*&)': main.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if (ind >= S.size ()) | ~~~~^~~~~~~~~~~~ main.cpp:43:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | while (ind < S.size () && isdigit (S [ind])) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void Tree::compute()': main.cpp:89:13: warning: unused variable 'p' [-Wunused-variable] 89 | int p = 0; | ^ main.cpp: In function 'void solve(int)': main.cpp:96:13: warning: division by zero [-Wdiv-by-zero] 96 | cer /= 0; | ~~~~^~~~