Compilare: user.cpp: In function ‘void read()’: user.cpp:13: warning: unused variable ‘j’ user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void rot()’: user.cpp:30: warning: unused variable ‘j’ user.cpp:30: warning: unused variable ‘dy’ user.cpp: In function ‘void check(int)’: user.cpp:39: warning: unused variable ‘j’ user.cpp: In function ‘void work()’: user.cpp:68: warning: ‘da’ is used uninitialized in this function