/in/foo.cc: In function 'int main()':
/in/foo.cc:26:81: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   printf("%d\n",2ll*T[n]%mod*qp(qp(2,n),mod-2)%mod*qp((qp(2,n)+1)%mod,mod-2)%mod);
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^