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Can someone explain what's going on with the tests in Task A Codeforces Round 1004 (Div. 2)?
By Qw04_Dragoknight, history, 15 months ago, In English

This is my first post on codeforces, so I apologize for the quality. In the last 1004th round, I tilted hard because of Task A. I think there's a mistake in the tests here. Can someone explain me why I got WA in test case 2. There was x = 1 and y = 9. So if we take n=9 S(9)=9 and S(n+1)=S(10)=1, and the answer is YES.

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15 months ago, hide # |
 
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    15 months ago, hide # ^ |
     
    Vote: I like it +5 Vote: I do not like it

    if x=9 and y=1 then n=9, s(9)=9=x and s(9+1)=s(10)=1=y but there is x=1 and y=9 so, NO is correct answer and YES is wrong answer

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