Run ID: 43252

Main.cc: In function ‘int main()’:
Main.cc:13:39: error: ‘__popcount’ was not declared in this scope
         cin>>n>>x,ans=((x>>1)<<1),cnt=__popcount(x);
                                       ^~~~~~~~~~
Main.cc:13:39: note: suggested alternative: ‘__llround’
         cin>>n>>x,ans=((x>>1)<<1),cnt=__popcount(x);
                                       ^~~~~~~~~~
                                       __llround