Compilare: user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:41:43: 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:68:47: 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 function ‘void write()’: user.cpp:132:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vagoane.out", "w", stdout); ^ user.cpp: In function ‘void read()’: user.cpp:127:5: warning: ‘sum’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (sum < 0) ^