Consider the following functions. For each, give the asymptotic running time in $\backslash$Theta

notation as a function of n$.$ Justify your answer.

$1$ def reverse$($ds$)$:

$2$ n $=$ len$($ds$)$

$3$ for i in range$($n$//2)$:

$4$ # swap digits at positions i and n$-$i$-1$

$5$ ds$[$i$],$ ds$[$n$-$i$-1]=$ ds$[$n$-$i$-1],$ ds$[$i$]$