For the Watch

In the north, the Night King has started preparing for the great war. He has an army of n wights. These wights have different strength values which is denoted by an array $A$ i.e. $A[i]$ denotes the strength of the $i$th wight where 0$\le$i$\lt$n . The total strength of the wights is the successive powers of their strengths i.e. if the wights have strength $p$,$q$,$r$,$s$,$t$ then their total stre