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The Cow Gathering

USACO · 2018 · December · platinum-3

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greedy · trees

The organizer’s problem statement is available at the official source link.

sample trace

The Cow Gathering: greedy walkthrough

The Cow Gathering: use the linked editorial?s greedy, trees idea on the published sample, then verify the displayed output.

Published input5 1 1 2 2 3 3 4 4 5 2 4modelAlgorithm ideaProcess choices in the order justified by the editorial and maintain the invariant that each accepted choice remains safe.task resultExpected output0 0 1 1 1
  1. 1

    Order

    Arrange candidates by the criterion used by the task?s greedy strategy.
  2. 2

    Choose

    Accept the next locally safe option while preserving the feasibility invariant.
  3. 3

    Finish

    Read the accumulated result and check it against the sample output.
  4. 4

    Verify the sample

    Use the published sample output to check the result of this idea on the displayed input.
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