Compilare: user.cpp: In function ‘long int cb(long int, long int)’: user.cpp:35: warning: suggest parentheses around ‘+’ inside ‘>>’ user.cpp:36: warning: suggest parentheses around ‘+’ inside ‘>>’ user.cpp: In function ‘int main()’: user.cpp:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result