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Up: CSE 2320: Algorithms and Previous: Delete

Pseudocode

Delete(T,x)                            ; Returns deleted node
  if left(x) = NIL or right(x) = NIL
  then d = x                           ; Case I and II
  else d = Successor(x)                ; Case III
  if left(d) <> NIL                    ; Get child of node to be removed
  then c = left(d)
  else c = right(d)
  if c <> NIL
  then Parent(c) = Parent(d)           ; Remove node d
  if Parent(d) = NIL
  then root(T) = c
  else if d = left(parent(d))
       then left(parent(d)) = c
       else right(parent(d)) = c
  if d <> x                            ; Case III
  then key(x) = key(d)
  return(d)

BST Insertion Example



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