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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
do
do upper upper until listupper S Pivotvalue
do lower lower 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 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 using this alternative method for PivotList. Do question a
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