Compilare: main.cpp: In member function 'int Solution::compute(const std::string&)': main.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int i = 0; i < s.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:45:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | while (i < s.size() && isDigit(s[i])) { | ~~^~~~~~~~~~ main.cpp: In member function 'int Solution::eval(int, int, char)': main.cpp:39:5: warning: control reaches end of non-void function [-Wreturn-type] 39 | } | ^