Compilare: user.cpp:3: warning: non-local variable ‘<anonymous struct> a [101]’ uses anonymous type user.cpp: In function ‘int main()’: user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ‘minx1’ may be used uninitialized in this function user.cpp:34: warning: ‘minx2’ may be used uninitialized in this function