Compilare: main.cpp: In function 'int main()': main.cpp:25:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while(in<s.size()) | ~~^~~~~~~~~ main.cpp:54:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | while (in < s.size()) | ~~~^~~~~~~~~~ main.cpp:103:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | while(in<s.size()) | ~~^~~~~~~~~ main.cpp:130:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 130 | while(in<s.size()) | ~~^~~~~~~~~ main.cpp:150:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 150 | if(in==s.size()) | ~~^~~~~~~~~~