Compilare: user.cpp: In function ‘void back(int, int)’: user.cpp:19: warning: unused variable ‘init’ user.cpp:20: warning: unused variable ‘initpr’ user.cpp:21: warning: unused variable ‘initg’ user.cpp: In function ‘bool ver(int)’: user.cpp:39: warning: unused variable ‘k’ user.cpp:39: warning: unused variable ‘l’ user.cpp: In function ‘int main()’: user.cpp:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:57: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result