Compilare: user.cpp: In function ‘int main()’: user.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;(1<<i)<=p;i++) ^ user.cpp:10:17: warning: unused variable ‘i’ [-Wunused-variable] unsigned n,p,i; ^ user.cpp:13:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.in","r",stdin); ^ user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.out","w",stdout); ^ user.cpp:16:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&p); ^