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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Auto comment: topic has been updated by Qw04_Dragoknight (previous revision, new revision, compare).
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