Compilare: user.cpp: In function ‘void ReadInput()’: user.cpp:22: 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: In function ‘void GenerateAllNumbers()’: user.cpp:130: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void WriteOutput()’: user.cpp:320: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result