Compilare: user.cpp: In function ‘int main()’: user.cpp:73: warning: left-hand operand of comma has no effect user.cpp:81: warning: left-hand operand of comma has no effect user.cpp:123: warning: left-hand operand of comma has no effect user.cpp:128: warning: left-hand operand of comma has no effect user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:7: warning: ‘xtrb’ may be used uninitialized in this function user.cpp:7: warning: ‘ytrb’ may be used uninitialized in this function