Compilare: user.cpp: In function ‘int main()’: user.cpp:29: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:25: 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 ‘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:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:29: warning: ‘pi’ may be used uninitialized in this function user.cpp:29: warning: ‘pj’ may be used uninitialized in this function