Compilare: main.cpp: In function 'std::string get_exp(std::string)': main.cpp:50:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | while(p < s.size()) | ~~^~~~~~~~~~ main.cpp: In function 'int parametru(std::string, int&)': main.cpp:136:26: warning: array subscript has type 'char' [-Wchar-subscripts] 136 | return val[s[t++]] * semn; | ^ main.cpp: In function 'int main()': main.cpp:179:21: warning: array subscript has type 'char' [-Wchar-subscripts] 179 | val[s[0]] = get_num(s); | ^