How is this test case correct for Div1 250 SRM 680?

Правка en2, от rhezo, 2016-04-28 03:13:02

How is the test case given in the image for this problem correct? The only possible sets are {9,10,11} or {9,10,12}. None of them have exactly n/2 terms even or odd. Please help!

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  Rev. Язык Кто Когда Δ Комментарий
en4 Английский rhezo 2016-04-28 05:51:11 9
en3 Английский rhezo 2016-04-28 03:14:01 83
en2 Английский rhezo 2016-04-28 03:13:02 90
en1 Английский rhezo 2016-04-28 03:12:10 303 Initial revision (published)