Ordered sequence

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General Information

Representation invariant:

  1. The abstract data structure ordered sequence implements sorted sequences as defined here.
  2. This abstract data structure is generic and parameterized by a fixed key type [math]\displaystyle{ \mathcal{K} }[/math].

Insert at position

Input: A key [math]\displaystyle{ K \in \mathcal{K} }[/math] and a nonnegative integral position [math]\displaystyle{ \ell }[/math].

Output: a Boolean value, which is true if, and only if, [math]\displaystyle{ \ell\in\{0,\ldots,n\} }[/math], where [math]\displaystyle{ n }[/math] is the length of the list.

Precondition:

Postcondition: If the output ist true, a new element with the key [math]\displaystyle{ K }[/math] is inserted at position [math]\displaystyle{ \ell }[/math].

Find

Input: A key [math]\displaystyle{ K \in \mathcal{K} }[/math].

Output: A Boolean value, which is true if, and only if, [math]\displaystyle{ K }[/math] is currently contained in the sequence.

Precondition:

Postcondition:

Remove

Input: A key [math]\displaystyle{ K \in \mathcal{K} }[/math].

Output: A Boolean value, which is 'true' if, and only if, [math]\displaystyle{ K }[/math] is currently stored in the sequence.

Precondition:

Postcondition: If the output is 'true', one occurrence of [math]\displaystyle{ K }[/math] is removed.

Known Implementations

  1. Linked list
  2. Doubly-linked list
  3. Array list