Compilare: main.cpp: In member function 'void Trie::add_to_trie(long long int, std::string, long long int)': main.cpp:26:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | if(cuv_ind == cuv.length()) { | ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In member function 'void Trie::remove_from_trie(long long int, std::string, long long int)': main.cpp:39:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if(cuv_ind == cuv.length()) { | ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In member function 'long long int Trie::get_ap(long long int, std::string, long long int)': main.cpp:56:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | if(cuv_ind == cuv.length()) { | ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In member function 'long long int Trie::get_pref_len(long long int, std::string, long long int)': main.cpp:67:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | if(cuv_ind == cuv.length()) { | ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:76:9: warning: control reaches end of non-void function [-Wreturn-type] 76 | } | ^