
(a)
Explain the assumption that Line 7 can be performed in O(1) actual time.
(a)

Explanation of Solution
For performing line 7, the time taken is proportional to the number of children does x have. For adding each child in the root list requires to update the parent’s pointer to NULL instead of x.
Therefore, the updating of parent pointer to x is wrong in this assumption.
(b)
Give anupper bound on the actual time of PISANO-DELETE, when node x is not inH.min .
(b)

Explanation of Solution
An actual cost of bounded by x.degree and updating all children of x takes constant time so, the actual time of PISANO-DELETE is
Hence, the upper bound on the actual time is
(c)
Use PISANO-DELETE( H,x ), describe that the node x is not a root, bound the potential of H’ in terms of x.degree, c, t ( H ) and m ( H ).
(c)

Explanation of Solution
Explanation:
As given CASCASDING-CUT rule we know that if it marked more than one node then
If the children increased from the previous that x had then equation will become
Now taking the consideration and according to question, combiningthese expressions the bound of potential is −
(d)
Conclude that the amortized time for PISANO-DELETE is asymptotically no better than for FIB-DELETE, even when x
(d)

Explanation of Solution
The amortized time for PISANO-DELETE is asymptotically is
When x
Therefore, the amortized time for PISANO-DELETE is asymptotically no better than for FIB-DELETE, even when x
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Chapter 19 Solutions
Introduction to Algorithms
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