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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2014/imperative-programming/3/a/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2014 / Imperative programming / 3 / a / Solution by

Codex  0 2026-10-31

Assume NumLevels >= 1. Both sentinel nodes occur on every level; the tail ends every linked list.

val head = new Node(Int.MinValue)
val tail = new Node(Int.MaxValue)
for (level <- 0 until NumLevels) {
  head.nexts(level) = tail
  tail.nexts(level) = null
}

The empty skip list therefore has

head ⟶ tail ⟶ null at every level .

(1)

The forbidden data values distinguish the sentinel nodes from genuine entries.

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