Algorithm 1 Modified Grover’s algorithm to extract the desired answer.

$t\leftarrow 0$ $\left|\mathsf{\Psi }\right(0)\rangle =|Answer\rangle$ while  $t<T$  do     $\left|\mathsf{\Psi }\right(t+1)\rangle =\mathbf{D}\mathbf{U}|\mathsf{\Psi }\left(t\right)\rangle$     $t\leftarrow t+1$ end while Measure state $\left|\mathsf{\Psi }\right(T)\rangle$ in the computational basis.