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: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 == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int count(nod*, std::string&, int)': main.cpp:68:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | if(pos == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int longest_common_prefix_for_word(std::string&, int, nod*)': main.cpp:76:121: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | int longest_common_prefix_for_word(std::string &word, int index, nod *current_node) { if( current_node == NULL or index == word.size()) return 0; int letter = word[index] - 'a'; if(current_node->next[letter] != NULL) return 1 + longest_common_prefix_for_word(word, index + 1, current_node->next[letter]); return 0; } | ~~~~~~^~~~~~~~~~~~~~