Compilare: main.cpp: In function 'int main()': main.cpp:23:12: warning: array subscript has type 'char' [-Wchar-subscripts] f[c] = 1; ^ main.cpp: In function 'void eval(char, int*, std::__cxx11::string)': main.cpp:39:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a[poz] != ')' && a.size() > poz) ~~~~~~~~~^~~~~ main.cpp:44:27: warning: array subscript has type 'char' [-Wchar-subscripts] rez[a[poz]]--; ^ main.cpp:46:27: warning: array subscript has type 'char' [-Wchar-subscripts] rez[a[poz]]++; ^ main.cpp:34:9: warning: unused variable 'nr' [-Wunused-variable] int nr; ^~