Compilare: user.cpp: In constructor ‘trieNode::trieNode()’: user.cpp:23:40: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(tree, NULL, sizeof(tree)); ^ user.cpp: In function ‘void inserare(trieNode*, std::string, int)’: user.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nrCar == w.size()){ ^ user.cpp: In function ‘bool delete_word(trieNode*, std::string, int)’: user.cpp:47:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nrCar == w.size()){ ^ user.cpp: In function ‘int QuerryWords(trieNode*, std::string, int)’: user.cpp:65:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nrCar == w.size()){ ^ user.cpp: In function ‘int QuerryPrefix(trieNode*, std::string, int, int)’: user.cpp:78:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nrCar == w.size() or node->tree[w.at(nrCar) - 'a'] == NULL){ ^