Compilare: user.cpp: In function ‘void insert(std::__cxx11::string&, int, trie*&)’: user.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (position == word.size()) ~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘void stergere(std::__cxx11::string&, int, trie*&)’: user.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (position == word.size()){ ~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int count(std::__cxx11::string&, int, trie*&)’: user.cpp:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(position == word.size()){ ~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int longest(std::__cxx11::string&, int, trie*&)’: user.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (position == word.size()) return 0; ~~~~~~~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:68:13: warning: unused variable ‘pos’ [-Wunused-variable] int op, pos = 0; ^~~