Compilare: user.cpp: In constructor ‘trie::trie()’: user.cpp:14:36: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(fiu,NULL,sizeof(fiu)); ^ user.cpp: In function ‘int codif(char)’: user.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘char decod(int)’: user.cpp:39:1: warning: control reaches end of non-void function [-Wreturn-type] } ^