Eroare de compilare: user.cpp: In function ‘void push_back(int)’: user.cpp:13: error: ‘back’ was not declared in this scope user.cpp: In function ‘void push_front(int)’: user.cpp:22: error: ‘front’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:36: error: expected initializer before ‘front’ user.cpp:37: error: ‘back’ was not declared in this scope user.cpp:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, 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:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result