Compilare: user.cpp: In function ‘void update(int, int, int, int, int, int)’: user.cpp:81:13: warning: unused variable ‘ok1’ [-Wunused-variable] int ok1 = 0, ok2 = 0; ^ user.cpp:81:22: warning: unused variable ‘ok2’ [-Wunused-variable] int ok1 = 0, ok2 = 0; ^ user.cpp: In function ‘int main()’: user.cpp:172:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("eliminare.out","w", stdout); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:21:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:43:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^