A978 | Delegation--Platinum

Farmer John's farm consists of $N$ pastures ($2 \leq N \leq 10^5$) connected
by $N-1$ roads, so that any pasture is reachable from any other pasture. That
is, the farm is a tree. But after 28 years of dealing with the tricky
algorithmic problems that inevitably arise from trees, FJ has decided that a
farm in the shape of a tree is just too complex. He believes that algorithmic
problems are simpler on paths.
Thus, his plan is to partition the set of roads into several paths, and
delegate responsibility for each path to a worthy farm hand. To avoid
contention, he wants each path to be the same length. He wonders for which
lengths there exists such a partition.
More precisely, for each $1 \leq K \leq N-1$, help Farmer John determine
whether the roads can be partitioned into paths of length exactly $K$.

* In test cases 2-4 the tree forms a star; at most one vertex has degree greater than two.
* Test cases 5-8 satisfy $N\le 10^3$.
* Test cases 9-15 satisfy no additional constraints..

The first line contains a single integer $N$.
The next $N-1$ lines each contain two space-separated integers $a$ and $b$
describing an edge between vertices $a$ and $b$. Each of $a$ and $b$ is in the
range $1 \ldots N$.