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heapify down

Attractive Alpaca answered on July 12, 2020 Popularity 9/10 Helpfulness 2/10

answer heapify down

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heapify down

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Heapify down is used when we remove the top element from a heap. Removal of an element is done by swapping the top element with the last element at the bottom of the tree, removing the last element, and then heapfying the new top element down to maintain the heap property. Because this moves down the heap tree, it must perform two comparisons per iteration, with the left child and the right child elements, then swap with the smaller one. Because of this, heapify down is usually more complex to implement than heapify up.

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Contributed on Jul 12 2020

Attractive Alpaca

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Heapify(array, size, i)
  set i as largest
  leftChild = 2i + 1
  rightChild = 2i + 2
  
  if leftChild > array[largest]
    set leftChildIndex as largest
  if rightChild > array[largest]
    set rightChildIndex as largest

  swap array[i] and array[largest]

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Contributed on Dec 26 2022

Hilarious Heron

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heapify down

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