Compilare: main.cpp: In member function 'void Trie::add_word(vertex*, std::string, int, int)': main.cpp:28:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp:31:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i = 0; i < nod->letter.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'vertex* Trie::find_word(vertex*, std::string, int)': main.cpp:42:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int i = 0; i < nod->letter.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Trie::add_word_count(vertex*, std::string, int)': main.cpp:59:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | if (y == s.length()) | ~~^~~~~~~~~~~~~ main.cpp:62:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for (int i = 0; i < nod->letter.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Trie::reset_tree(vertex*)': main.cpp:70:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<vertex*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int i = 0; i < nod->children.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Trie::find_difs(vertex*, std::string, int, Trie, int&)': main.cpp:79:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<vertex*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int i = 0; i < nod->children.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~