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Making Friends

USACO · 2022 · December · platinum-2

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

sample trace

Making Friends: sample trace

Trace this official sample for Making Friends: use the task rules to map the shown input to the expected output.

Published input7 6 1 3 1 4 7 1 2 3 2 4 3 5modelAlgorithm ideaApply the task rule to this published instance, preserving the relationships defined by the statement.task resultExpected output5
  1. 1

    Read the sample

    Use the official example for Making Friends as the concrete instance.
  2. 2

    Follow the task relation

    Apply the exact rule in the official statement to the displayed values.
  3. 3

    Check the result

    Verify that the final value matches the published expected output.
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