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Swapity Swapity Swap

USACO · 2020 · February · silver-1

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binary-search · trees · combinatorics · simulation

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

sample trace

Swapity Swapity Swap: binary search walkthrough

Swapity Swapity Swap: use the linked editorial?s binary search, trees idea on the published sample, then verify the displayed output.

Published input7 2 2 2 5 3 7modelAlgorithm ideaSearch a monotone boundary by repeatedly testing a midpoint with the editorial?s feasibility condition.task resultExpected output1 2 4 3 5 7 6
  1. 1

    Range

    Set the candidate interval for the quantity the task asks to minimize or maximize.
  2. 2

    Test

    Evaluate the task?s feasibility condition at the midpoint.
  3. 3

    Narrow

    Keep the half containing the true boundary until the answer is determined.
  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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