Compilare: user.cpp: In function ‘int main()’: user.cpp:90:30: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[23]’ [-Wformat=] while(scanf("%d %s",&t,&v) != EOF) ^ user.cpp: In function ‘int prefix(char*, trie*)’: user.cpp:83:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:87:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin); ^ user.cpp:88:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out","w",stdout); ^