Compilare: user.cpp:3: warning: non-local variable ‘<anonymous struct> a [51][51]’ uses anonymous type user.cpp:3: warning: non-local variable ‘<anonymous struct> b [51][51]’ uses anonymous type user.cpp:3: warning: non-local variable ‘<anonymous struct> d [51][51]’ uses anonymous type user.cpp:3: warning: non-local variable ‘<anonymous struct> c [51][51]’ uses anonymous type user.cpp: In function ‘int main()’: user.cpp:108: warning: suggest parentheses around ‘&&’ within ‘||’ 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 ‘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:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result