This appears to be duplicating an error in the original Problem: according to the problem specification, having an input of  should yield a result of "false", as there is no OTHER element to compare the 1 to! You can easily fix this inconsistency by either --- changing your problem specification (mention that you can compare to all vector elements, not just the 'other' elements) or --- by changing the correct result to "false" in your Test Suite.
Please check comments made about the original Problem to avoid duplicating errors or inconsistencies.
Reverse Run-Length Encoder
Project Euler: Problem 1, Multiples of 3 and 5
Swap two numbers
Max of a Vector
NaN (欠損値) が含まれている行を削除しよう
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