Compilare: user.cpp: In function ‘int main()’: user.cpp:42: warning: operation on ‘dim’ may be undefined user.cpp:42: warning: operation on ‘dim’ may be undefined user.cpp:43: warning: operation on ‘dim’ may be undefined user.cpp:43: warning: operation on ‘dim’ may be undefined user.cpp:30: warning: unused variable ‘c’ user.cpp:30: warning: unused variable ‘vc’ user.cpp:30: warning: unused variable ‘uv’ user.cpp:30: warning: unused variable ‘j’ user.cpp:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void cb(int, int)’: user.cpp:19: warning: ‘m’ may be used uninitialized in this function