Compilare: main.cpp: In function 'void add(nod*, std::string&, int)': main.cpp:27:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if(poz == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'void del(nod*, std::string&, int)': main.cpp:48:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | if(poz == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int count_word(std::string&, int, nod*)': main.cpp:69:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | if(index == word.size()) | ~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int longest_common_prefix_for_word(std::string&, int, nod*)': main.cpp:79:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | if( current_node == NULL or index == word.size()) | ~~~~~~^~~~~~~~~~~~~~