Compilare: user.cpp: In function ‘int main()’: user.cpp:41:17: warning: unused variable ‘b’ [-Wunused-variable] long long y,b,r,d; ^ user.cpp:41:19: warning: unused variable ‘r’ [-Wunused-variable] long long y,b,r,d; ^ user.cpp:42:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.in","r",stdin); ^ user.cpp:43:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirala2.out","w",stdout); ^ user.cpp:44:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^