Compilare: main.cpp: In function 'void add(trie*, int)': main.cpp:25:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if (poz == s.length()) | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void sterge(trie*, int)': main.cpp:39:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if (poz == s.length()) | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:56:27: 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 j = 0; j < s.length(); j++) | ~~^~~~~~~~~~~~ main.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int j = 0; j < s.length(); j++) | ~~^~~~~~~~~~~~