Compilare: user.cpp: In function ‘int main()’: user.cpp:38: warning: operation on ‘dim’ may be undefined user.cpp:43: warning: operation on ‘dim’ may be undefined user.cpp:45: warning: operation on ‘dim’ may be undefined user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:26: 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