Compilare: user.cpp: In function ‘void rsw()’: user.cpp:84:32: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[22]’ [-Wformat=] scanf("%d %s\n", &r, &w); ^ user.cpp:79:35: 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:80:37: 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:84:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %s\n", &r, &w); ^