P03 — Single-Pass Accumulate With a Condition

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What is inside

• 1. Why this matters
• 2. The template
• 3. The two real questions, and their traps
• 4. Index vs value — the distinction that costs marks
• 5. Avoiding division when comparing to an average
• 6. Complexity
• 7. Traps checklist
• 8. Practice — 12 problems