Compilare: user.cpp: In function ‘int main()’: user.cpp:30: warning: unused variable ‘n’ user.cpp:30: warning: unused variable ‘i’ user.cpp:30: warning: unused variable ‘q’ user.cpp:30: warning: unused variable ‘s’ user.cpp:30: warning: unused variable ‘t’ user.cpp:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ‘k13’ may be used uninitialized in this function user.cpp:32: warning: ‘k12’ may be used uninitialized in this function