Eroare de compilare: user.cpp: In function ‘void back(int, int, int, int, int)’: user.cpp:30: error: ‘memcpy’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:125: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:126: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:128: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:135: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:144: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result