Compilare: user.cpp: In function ‘void divide(long long int, long long int)’: user.cpp:20:15: warning: unused variable ‘l1’ [-Wunused-variable] long long l1,l2,mid,i,j; ^ user.cpp:20:18: warning: unused variable ‘l2’ [-Wunused-variable] long long l1,l2,mid,i,j; ^ user.cpp: In function ‘int main()’: user.cpp:51:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin); ^ user.cpp:52:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out","w",stdout); ^ user.cpp:53:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^ user.cpp:55:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&v[i].x,&v[i].y); ^