Compilare: user.cpp: In member function ‘void Trie::insert(std::string, int, int)’: user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == s.size()) { ^ user.cpp: In function ‘void BFS(Trie*)’: user.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (start < Q.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:89:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.size(); i++) { ^ user.cpp:99:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < result.size(); i++) ^ user.cpp:71:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^