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+1

He was born in 2007
+186

King
On Duelist1234 → Dividing factorials, 2 years ago
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I don't think factorials is necessary in the Problem C
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I think there is this set of data: n = 14, k = 720729. The number of 1s actually equals to 19, and you give 17. I think your solution is inaccurate for the case where s is not equal to k.