Compilare: main.cpp: In function 'bool expresie()': main.cpp:26:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | while(ind + 1 < s.size() && s.substr(ind, 2) == "OR") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool termen()': main.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while(ind + 2 < s.size() && s.substr(ind, 3) == "AND") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool factor()': main.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | while(ind + 2 < s.size() && s.substr(ind, 3) == "NOT") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool altcv()': main.cpp:63:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | else if(ind + 1 >= s.size() || s[ind + 1] > 'Z' || s[ind + 1] < 'A') | ~~~~~~~~^~~~~~~~~~~