Compilare: user.cpp: In function ‘int main()’: user.cpp:10:21: warning: unused variable ‘com’ [-Wunused-variable] long long x, y, com, con = 63; ^ user.cpp:10:26: warning: unused variable ‘con’ [-Wunused-variable] long long x, y, com, con = 63; ^ user.cpp:7:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.in", "r", stdin); ^ user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taste.out", "w", stdout); ^ user.cpp:11:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &x, &y); ^