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Problem · Array

Track Package Receipt Gaps

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Problem statement

Process a finite sequence of package-receipt operations. Each row of operations has one of these forms:

The problem statement continues
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Examples

Example 1

operations = [["receive","2"],["receive","0"],["report"],["receive","1"],["report"]]return = [[0,2,1],[2,2]]

At the first report, IDs 0 and 2 have arrived. The contiguous prefix ends at 0, the maximum is 2, and ID 1 is missing. After receiving ID 1, the complete prefix ends at 2 and there are no gaps.

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Reported in 1 Amazon interview this week

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FastPrep Pro
Reported in 1 Amazon interview this week

Unlock this recently reported problem

FastPrep Pro gives you full access to interview problems reported within the last week.

  • Full problem statement and constraints
  • 1 more worked example, explained
  • Guided hints and editorial
  • Run your code on real test cases
$9/month

Pro subscription, billed yearly — or $19 month-to-month. Cancel anytime.

Free plan — 2 of 2 free unlocks used this week