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True or False Test

USACO · 2025 · February · platinum-3

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prefix-sums · trees · sorting · data-structures

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

sample trace

True or False Test: prefix sums walkthrough

True or False Test: use the linked editorial?s prefix sums, trees idea on the published sample, then verify the displayed output.

Published input2 3 3 1 4 2 2 1 0modelAlgorithm ideaStore cumulative aggregates so a range can be answered from two prefix values instead of rescanning its elements.task resultExpected output-3 1 7
  1. 1

    Accumulate

    Build the running total or count across the input order.
  2. 2

    Query

    Subtract the prefix before a range from the prefix at its end.
  3. 3

    Finish

    Apply the task?s boundary adjustment and compare with the sample result.
  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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