Compilare: main.cpp: In function 'int rotunda()': main.cpp:45:19: 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 ( poz_s < s.size() && s[poz_s] != ')' ) { | ~~~~~~^~~~~~~~~~ main.cpp: In function 'int patrata()': main.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | while ( poz_s < s.size() && s[poz_s] != ']' ) { | ~~~~~~^~~~~~~~~~ main.cpp: In function 'int expresie()': main.cpp:74:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | while ( poz_s < s.size() ) { | ~~~~~~^~~~~~~~~~