Compilare: user.cpp: In function ‘int main()’: user.cpp:61:21: warning: variable ‘alfa’ set but not used [-Wunused-but-set-variable] int alfa; ^ user.cpp:53:13: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a; ^ user.cpp:27:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avarcolaci.in", "r", stdin); ^ user.cpp:28:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avarcolaci.out", "w", stdout); ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* fopen(const char*, const char*)’, declared with attribute warn_unused_result [-Wunused-result] fopen("avarcolaci.in", "r"); ^