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PivotList ( list, first, last ) list the elements to work with first the index of the first element last the index of the last

PivotList ( list, first, last)
list the elements to work with
first the index of the first element
last the index of the last element
Pivotvalue = list [ first ]
lower = first
upper = last +1
do
do upper = upper -1 until list[upper] S Pivotvalue
do lower = lower +1 until list [lower] Pivotvalue
Swap ( list [ upper ], list [ lower ])
until lower upper
// undo the extra exchange
Swap ( list [ upper ], list [ lower ])
// move pivot point into correct place
Swap( list [ first ], list [ upper ])
return upper
Trace the operation of Quicksort on the list ,7,35,4. Show the list order and the stack of (first, last, pivot) values at the start of every call. Count the number of comparisons and swaps that are done.
a. Do Question 1 using this alternative method for PivotList. Do question a.
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