Compilare: user.cpp: In function ‘void read()’: user.cpp:56:9: warning: unused variable ‘x’ [-Wunused-variable] int x, y, l = 0; ^ user.cpp:56:12: warning: unused variable ‘y’ [-Wunused-variable] int x, y, l = 0; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:27:47: 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:49:51: 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); ^ user.cpp: In function ‘void write()’: user.cpp:94:40: 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); ^