Compilare: main.cpp: In function 'void ins(trie*, std::string, int)': main.cpp:19:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if(p == a.size()){ | ~~^~~~~~~~~~~ main.cpp: In function 'int query(trie*, std::string, int)': main.cpp:31:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if(p == a.size()) return node->cnt; | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int i = 0; i < f.size(); i++){ | ~~^~~~~~~~~~