Compilare: main.cpp: In constructor 'trie::trie()': main.cpp:28:48: 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 trieOp::insert(trie*&, std::__cxx11::string&, int)': main.cpp:39:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == buff.size()) ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'void trieOp::remove(trie*&, std::__cxx11::string&, int)': main.cpp:56:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == buff.size()) ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int trieOp::get_freq(trie*&, std::__cxx11::string&, int)': main.cpp:71:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (buff.size() == ind) ~~~~~~~~~~~~^~~~~~ main.cpp: In function 'int trieOp::get_longest_prefix(trie*&, std::__cxx11::string&, int)': main.cpp:83:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (node->freq > 0 && ind < buff.size()) ~~~~^~~~~~~~~~~~~