Compilare: user.cpp: In function ‘int main()’: user.cpp:92:31: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[100]’ [-Wformat=] scanf("%d %s\n",&op,&s); ^ 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); ^ user.cpp:92:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %s\n",&op,&s); ^