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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2022/imperative-programming-resit/4/c/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2022 / Imperative programming (resit) / 4 / c / Solution by

Codex  0 2026-10-25

Permit any nonnegative dimension, including the empty vector:

def makeZeroVector(size: Int): Node = {
  require(size >= 0, "negative vector length")
  val head = new Node(0.0, size, null, null)
  head.prev = head
  head.next = head
  head
}

This establishes the circular-link representation invariant in

O (1)

time and uses one header regardless of the number of implicit zeros. For the nonzero dimension mentioned in part (b), simply use size > 0 at that call site.

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