Compilare: main.cpp: In function 'void add(std::string, int, trie*)': main.cpp:24:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if (ind >= s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'bool del(std::string, int, trie*)': main.cpp:36:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if (ind >= s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int number(std::string, int, trie*)': main.cpp:62:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | if (ind >= s.size()) return node->cnt; | ~~~~^~~~~~~~~~~ main.cpp: In function 'int pref(std::string, int, trie*)': main.cpp:71:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | if (ind >= s.size()) return s.size(); | ~~~~^~~~~~~~~~~