Compilare: main.cpp: In function 'int insert_word(trie*, char*)': main.cpp:30:15: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL){ ^~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:57:25: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] cuvant[nivel] = NULL; ^~~~ main.cpp: In function 'int insert_word(trie*, char*)': main.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type] } ^