Theme Demo

AخA
 
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function findSequence(goal) {
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  function find(start, history) {
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    if (start == goal)
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      return history;
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    else if (start > goal)
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      return null;
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    else
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      return find(start + 5, "(" + history + " + 5)") ||
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             find(start * 3, "(" + history + " * 3)");
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  }
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  return find(1, "1");
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}

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