Loops & totals
Keep a running total or count as a loop handles each item. Start at the right value, then update the result instead of replacing it.
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Searching & stopping
Keep checking after a mismatch. Return as soon as you find the answer, and use a fallback only after the search is over.
Counting & endpoints
Python ranges include the start but stop before the end. Check the first and last values, especially when a range should include both ends.
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