Compilare: user.cpp: In function ‘int main()’: user.cpp:49:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dtcsu.in", "r", stdin); ^ user.cpp:50:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dtcsu.out", "w", stdout); ^ user.cpp: In function ‘char getChar()’: user.cpp:17:46: warning: ignoring return value of ‘size_t fread_unlocked(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread_unlocked(buff, 1, 65536, stdin); ^