You encounter the following pseudocode, and you can assume it calls the procedure L INEARS EARC H implemented as we covered in class. MYSTERY$($A$,$ n$)1$ for i $=1$ to n $+12$ if L INEARS EARC H$($A$,$n$,$i$)==$ N IL

$3$ return i

$4$ return N IL

$($a$)$ Assume that the algorithm accepts an array of n distinct integers in the range $1..$n $+1.$ In

English, describe what this algorithm is trying to accomplish.