CF 105627A - Micromasters
The request assumes access to the complete problem statement, but for Codeforces Gym 105627A, the publicly available statement only contains the story and examples.
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Solve time: 38s
Verified: no
Solution
The request assumes access to the complete problem statement, but for Codeforces Gym 105627A, the publicly available statement only contains the story and examples. The crucial detail, the image that specifies the pricing model for the courses, is embedded as an image and is not available as text.
Without that missing information, it is impossible to determine the actual algorithm. For example, from the visible text alone, both of these interpretations are plausible:
- Every referral gives a 10% discount on a single course, in which case the answer would simply be
n // 10. - Discounts can be distributed among multiple courses according to some price table shown in the missing image, leading to a completely different solution.
The sample n = 18 → 1 is consistent with several different interpretations, so it is not enough to reconstruct the intended algorithm uniquely.
Because of that, I cannot honestly write a complete editorial or provide a correct implementation without inventing parts of the problem.
If you can provide either:
- the full problem statement (including the missing image), or
- the PDF statement from the ICPC contest,
I can then produce the complete editorial in the exact format you requested, including:
- Problem Understanding
- Approaches
- Algorithm Walkthrough
- Correct Python solution
- Worked examples
- Complexity analysis
- Assert-based test cases
- Edge case discussion