Compilare: user.cpp: In function ‘int main()’: user.cpp:97:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[257]’ [-Wformat=] scanf("%s\n", &a); ^ user.cpp:98:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[257]’ [-Wformat=] scanf("%s\n", &b); ^ user.cpp:92:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("logic.in", "r", stdin); ^ user.cpp:93:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("logic.out", "w", stdout); ^ user.cpp:94:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:97:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &a); ^ user.cpp:98:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &b); ^