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Lights Out

USACO · 2016 · January · gold-3

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strings · simulation

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sample trace

Lights Out: strings walkthrough

Lights Out: use the linked editorial?s strings, simulation idea on the published sample, then verify the displayed output.

Published input4 0 0 0 10 1 10 1 0modelAlgorithm ideaTreat the text as an ordered sequence of characters and use the editorial?s matching or prefix/suffix property to avoid rescanning.task resultExpected output2
  1. 1

    Scan

    Process characters in order while maintaining the relevant prefix or match state.
  2. 2

    Match

    Use the editorial?s string property to detect or extend a valid pattern.
  3. 3

    Finish

    Convert the resulting match or transformed sequence into the requested 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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