Compilare: main.cpp: In function 'void add_word(node*, const std::string&, int)': main.cpp:22:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if (i == word.size()) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'bool delete_word(node*, const std::string&, int)': main.cpp:39:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if (i == word.size()) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int get_frecv(node*, const std::string&, int)': main.cpp:57:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if (i == word.size()) return nod->frecv; | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int get_prefix(node*, const std::string&, int)': main.cpp:64:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if (i == word.size()) { | ~~^~~~~~~~~~~~~~