Ankit__'s blog

Help needed in a cses problem!
By Ankit__, history, 5 years ago, In English

hey guys! i need help in this problem.i've been stuck at it for a while now..any kind of help would be appreciated!

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5 years ago, # |
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It can be solved by inclusion-exclusion principle.

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5 years ago, # |
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https://en.wikipedia.org/wiki/Derangement

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