Compilare: main.cpp: In function 'void adds(nod*, int)': main.cpp:24:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if (pos==w.size()) { | ~~~^~~~~~~~~~ main.cpp: In function 'bool deletes(nod*, int)': main.cpp:37:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if (pos==w.size()) { | ~~~^~~~~~~~~~ main.cpp: In function 'int appears(nod*, int)': main.cpp:54:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | if (pos==w.size()) return parent->nr_ap; | ~~~^~~~~~~~~~ main.cpp: In function 'int common_prefix(nod*, int)': main.cpp:62:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | if (parent->fiu[w[pos]-'a']==0 || pos==w.size()) { | ~~~^~~~~~~~~~