Compilare: main.cpp: In member function 'void Trie::add_word(vertex*, std::string, int, int)': main.cpp:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp: In member function 'vertex* Trie::find_word(vertex*, std::string, int)': main.cpp:39:15: 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 (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp: In member function 'void Trie::add_word_count(vertex*, std::string, int)': main.cpp:55:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 110 | for (int j = 0; j < s.length(); j++) | ~~^~~~~~~~~~~~ main.cpp:114:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | for (int i = 0; i < v[0].length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp:121:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for (int j = 0; j < v[i].length(); j++) | ~~^~~~~~~~~~~~~~~