[June Problem-Spec Sync]: Practice Exercise Introductions (#3921)
* Synced practice exercise introductions to problem specifications.
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@@ -58,7 +58,7 @@ The position information encoding is calculated as follows:
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### Decimal number on the display
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16
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8
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### Actual eggs in the coop
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@@ -2,10 +2,10 @@
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At the Global Verification Authority, you've just been entrusted with a critical assignment.
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Across the city, from online purchases to secure logins, countless operations rely on the accuracy of numerical identifiers like credit card numbers, bank account numbers, transaction codes, and tracking IDs.
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The Luhn algorithm is a simple checksum formula used to ensure these numbers are valid and error-free.
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The Luhn algorithm is a simple checksum formula used to help identify mistyped numbers.
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A batch of identifiers has just arrived on your desk.
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All of them must pass the Luhn test to ensure they're legitimate.
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If any fail, they'll be flagged as invalid, preventing errors or fraud, such as incorrect transactions or unauthorized access.
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If any fail, they'll be flagged as invalid, preventing mistakes such as incorrect transactions or failed account verifications.
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Can you ensure this is done right? The integrity of many services depends on you.
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