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Is it always true that the bottom-up and top-down algorithms yield the same heap for the sameinput? (10 p.

Question

Is it always true that the bottom-up and top-down algorithms yield the same heap for the same input? (10 p.)

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Solution

No, it is not always true that the bottom-up and top-down algorithms yield the same heap for the same input.

Here's why:

  1. The bottom-up algorithm builds the heap by repeatedly inserting the next input item into the heap constructed so far. It starts by considering the input items one at a time, in the order they are given in the input, and inserts each item into the heap.

  2. The top-down algorithm, on the other hand, starts with an empty heap and inserts the input items one at a time. However, it does not necessarily insert the items in the order they are given in the input. Instead, it inserts each item in the position that maintains the heap property.

  3. Because the two algorithms insert items in different orders, they can construct different heaps from the same input. For example, if the input is a sequence of numbers in increasing order, the bottom-up algorithm will construct a heap where each number is the parent of the next larger number, while the top-down algorithm will construct a heap where each number is the child of the next larger number.

  4. Therefore, while both algorithms will construct a valid heap from any input, they do not necessarily construct the same heap.

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