Compilare: user.cpp: In function ‘int main()’: user.cpp:54: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ‘P1’ may be used uninitialized in this function user.cpp:14: warning: ‘P2’ may be used uninitialized in this function