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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2021/imperative-programming-resit/4/d/ii/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2021 / Imperative programming (resit) / 4 / d / ii / Solution by

Codex  0 2026-10-25

With that display format the output is

20
10
10
Queue status: [30, 40, 15]

The first removal takes the newly prepended left value

20

. The right removal later takes the most recently appended

10

. The next left removal takes the earlier

10

, leaving the ordered sequence $⟨ 30, 40, 15 ⟩$ . The two equal values are different occurrences, and the displayed order follows the links rather than numerical sorting.

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