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Derangement (chalkash) D(N) | HackNow
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Derangement (chalkash) D(N)
lock
UZ only
Qiyin
100 points
1 s
256 MB
Input format
Output format
Constraints
Examples
1
1
Example #1
Input
4
Output
9
Solution editor
Python 3
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Language
PYTHON
UTF-8
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4 spaces
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