1755.
Kolakoski
时间限制 1000 ms
内存限制 512 MB
This is Kolakosiki sequence: $1,2,2,1,1,2,1,2,2,1,2,2,1,1,2,1,1,2,2,1......$. This sequence consists of $1$ and $2$, and its first term equals $1$. Besides, if you see adjacent and equal terms as one group, you will get $1,22,11,2,1,22,1,22,11,2,11,22,1......$. Count number of terms in every group, you will get the sequence itself. Now, the sequence can be uniquely determined. Please tell HazelFan its $n$th element.
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For each test case:
A single line contains a nonnegative integer, denoting the answer.