Compilare: main.cpp: In member function 'void trie::add(std::string&, int, node*)': main.cpp:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::del(std::string&, int, node*)': main.cpp:53:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int trie::number_of_apperances(std::string&, int, node*)': main.cpp:70:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::find_longest_common_prefix(std::string&, int, node*, int&)': main.cpp:78:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | if(poz == s.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:112:28: warning: 'sol' may be used uninitialized [-Wmaybe-uninitialized] 112 | fout << sol << '\n'; | ^~~~ main.cpp:96:13: note: 'sol' was declared here 96 | int op, sol; | ^~~