Compilare: main.cpp: In constructor 'Trie::Trie()': main.cpp:21:54: warning: passing NULL to non-pointer argument 2 of 'void* memset(void*, int, size_t)' [-Wconversion-null] memset(this->neigh, NULL, sizeof(this->neigh)); ^ main.cpp: In function 'void operations::insert(Trie*&, std::__cxx11::string&, int)': main.cpp:31:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == seq.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void operations::remove(Trie*&, std::__cxx11::string&, int)': main.cpp:47:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == seq.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In function 'int operations::get_frequency_for_word(Trie*&, std::__cxx11::string&, int)': main.cpp:61:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == seq.size()) ~~~~^~~~~~~~~~~~~