Compilare: main.cpp: In function 'void insert(trie*, std::string&, short int, short int)': main.cpp:71:25: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for(short i = j ; i < a.size() ; i++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:139:23: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 139 | for(j = 0 ; j < sa.size() ; j++) | ~~^~~~~~~~~~~