Compilare: user.cpp: In function ‘void Read()’: user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: 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: In function ‘void Solve()’: user.cpp:55: warning: unused variable ‘i’ user.cpp:55: warning: unused variable ‘j’ user.cpp:55: warning: unused variable ‘k’ user.cpp: In function ‘void Write()’: user.cpp:151: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result