For this case, a number is defined ugly if it has prime factors consisting of only elements of x.
Find the nth ugly number.
so the ans is 15.
Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.
Inner product of two vectors
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Return fibonacci sequence do not use loop and condition
Sieve of Eratosthenes
generate the matrix
Abelian Sandpile - 01
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