Compilare: user.cpp: In function ‘void df(int)’: user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void back(int, int, int)’: user.cpp:60: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:134: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:135: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:137: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:139: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:141: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result