enigma.cpp: In constructor `trie::trie()': enigma.cpp:17: warning: passing NULL used for non-pointer argument passing 2 of `void* memset(void*, int, unsigned int)' enigma.cpp:17: warning: argument to non-pointer type `int' from NULL enigma.cpp: In function `int main()': enigma.cpp:27: warning: char format, different type arg (arg 5) enigma.cpp:29: warning: char format, different type arg (arg 3)