Compilare: main.cpp: In function 'void add(trie*, int, int)': main.cpp:34:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (poz<w.size()) { | ~~~^~~~~~~~~ main.cpp: In function 'void pop(trie*, int)': main.cpp:47:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | if (poz<=w.size()) { | ~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for (int i=0;i<w.size();i++) { | ~^~~~~~~~~ main.cpp:66:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int i=0;i<w.size();i++) { | ~^~~~~~~~~