Compilare: main.cpp: In constructor 'Trie::Trie()': main.cpp:25:38: warning: passing NULL to non-pointer argument 2 of 'void* memset(void*, int, size_t)' [-Wconversion-null] memset(son, NULL, sizeof(son)); ^ main.cpp: In function 'void addTrie(Trie*, int, const std::vector<int>&)': main.cpp:35:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == s.size()) { ~~~~^~~~~~~~~~~