Compilare: user.cpp: In function ‘int main()’: user.cpp:51: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:50: warning: ‘xmin’ may be used uninitialized in this function user.cpp:50: warning: ‘ymin’ may be used uninitialized in this function