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a(n){return n?n-a(a(a(n-1))):0;}
main(){printf("%d %d %d %d %d", a(0), a(1), a(5), a(15), a(20));}

Success #stdin #stdout 0s 2156KB

stdin

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Standard input is empty

stdout

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0 1 4 10 14

https://ideone.com/8O5mPR

language:

C (clang 8.0)

created:

visibility:

public

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