Compilare: user.cpp:15: warning: integer constant is too large for ‘long’ type user.cpp: In function ‘int main()’: user.cpp:29: warning: operation on ‘k’ may be undefined user.cpp:41: warning: operation on ‘k’ may be undefined user.cpp:53: warning: operation on ‘k’ may be undefined user.cpp:65: warning: operation on ‘k’ may be undefined user.cpp:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result