Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Given an Array A = <5,4,3,2,1> what will be the updated array A after we run some partition (A, 1 , 5)

some partition (a, p , r)

mid = (p + 2)/2

x = a[mid]

i = p - 1

j = r + 1

while (true)

do

        j = j - 1

 while (A[j] > x

do

  i = i + 1

while (A[i] < x)

if (i < j)

swap A[i}  and A[j}

else

return j

        

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