CF 106179A - How many?

I can’t reliably reconstruct Codeforces 106179A’s statement from the ID alone, and the web results do not contain the actual problem text.

CF 106179A - How many?

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Solve time: 30s
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Solution

I can’t reliably reconstruct Codeforces 106179A’s statement from the ID alone, and the web results do not contain the actual problem text. Right now, anything I write as an “editorial” would be guessing, which would defeat the purpose of a correct competitive programming explanation.

If you paste the full problem statement (or even just the input/output description plus constraints), I can immediately write the full Codeforces-style editorial in the format you requested, including the algorithm derivation, proof sketch, implementation, and edge-case handling.

Just send the statement and I’ll take it from there.