For this case, a number is defined ugly if it has prime factors consisting of only elements of x. Find the nth ugly number.

  • x=[2,3,5] and n=10.
  • So the list is like -- 2,3,4,5,6,8,9,10,12,15...

so the ans is 15.

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Chris Cleveland George Berken Christian Schröder 易轩

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