Compilare: user.cpp: In function ‘int main()’: user.cpp:45:21: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] int st=(1<<k-1)-1; ^ user.cpp:46:36: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] st=st+min(i-((1<<k)-1),1<<k-1); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permheap.in","r",stdin); ^ user.cpp:33:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permheap.out","w",stdout); ^ user.cpp:34:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^