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Vectors, Lists, Sequences

Vectors, Lists, Sequences. Vectors. Linear sequence s of n elements e rank – number of elements before e in s Vector supports access to elements via their ranks elemAtRank(r) replaceAtRank(r, e) insertAtRank(r, e) removeAtRank(r) size isEmpty. Vector Implementation.

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Vectors, Lists, Sequences

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  1. Vectors, Lists, Sequences

  2. Vectors • Linear sequence s of n elements e • rank – number of elements before e in s • Vector supports access to elements via their ranks • elemAtRank(r) • replaceAtRank(r, e) • insertAtRank(r, e) • removeAtRank(r) • size • isEmpty

  3. Vector Implementation • Extendable array implementation • when array is full, allocate new array of 2xs the size • copy elements into new array • Efficiency?

  4. Lists • Access/modify by “position” instead of rank • insertBefore(p, e) • insertAfter(p, e)

  5. Sequences • Supports functionality of vector and list • Additional functions • atRank(r) – returns position • rankOf(p) – returns rank

  6. Bubble Sort • Bubble sort • make n passes through a sequence and swap two elements if they are out of order (5 7 2 6 9 3)

  7. Bubble Sort on a Sequence • Algorithm

  8. Iterators • Step through a data structure one element at a time • hasNext() • Input: none Output: Boolean • next() • Input: none Output: Object

  9. Exercises • Give an adapter class to support the Stack interface using the functions of the vector ADT

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