Compilare: main.cpp: In function 'trieNode* getNode(trieNode*)': main.cpp:22:58: warning: passing NULL to non-pointer argument 2 of 'void* memset(void*, int, size_t)' [-Wconversion-null] memset(aux -> children, NULL, sizeof(aux -> children)); ^ main.cpp: In function 'void Insert(trieNode*, std::__cxx11::string)': main.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<key.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'trieNode* Delete(trieNode*, std::__cxx11::string, int)': main.cpp:54:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (depth == key.size()) ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int nrAp(trieNode*, std::__cxx11::string)': main.cpp:89:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<key.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'int maxPrefix(trieNode*, std::__cxx11::string)': main.cpp:105:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<key.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:125:23: warning: unused variable 'aux' [-Wunused-variable] trieNode *aux = Delete(root, c + 2, 0); ^~~