Compilare: main.cpp: In function 'void sameVar()': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); ++i) ~~^~~~~~~~~~ main.cpp:19:20: warning: array subscript has type 'char' [-Wchar-subscripts] fv[a[i]] = 1; ^ main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); ++i) ~~^~~~~~~~~~ main.cpp:22:21: warning: array subscript has type 'char' [-Wchar-subscripts] fv2[b[i]] = 1; ^ main.cpp: In function 'bool termen(std::__cxx11::string, int)': main.cpp:36:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < exp.size() && exp[pos] == '~') ~~~~^~~~~~~~~~~~ main.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < exp.size() && paranteze > 0) { ~~~~^~~~~~~~~~~~ main.cpp:56:28: warning: array subscript has type 'char' [-Wchar-subscripts] bool rez = val[exp[pos]]; ^ main.cpp: In function 'bool _and(std::__cxx11::string, int)': main.cpp:65:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < exp.size() && exp[pos] == '&') ~~~~^~~~~~~~~~~~ main.cpp: In function 'bool _xor(std::__cxx11::string, int)': main.cpp:72:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < exp.size() && exp[pos] == '^') ~~~~^~~~~~~~~~~~ main.cpp: In function 'bool _or(std::__cxx11::string, int)': main.cpp:79:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < exp.size() && exp[pos] == '|') ~~~~^~~~~~~~~~~~