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The first line of the input file $christmas-balls.in$ contains the only integer $N$ ($1 \le N \le 10^5$), the number of nodes of the tree.
The first line of the input file $christmas-balls.in$ contains the only integer $N$ $1 ≤ N ≤ 10^5$, the number of nodes of the tree.
The second line contains $N$ integers $C_i$ ($0 ≤ C_i < N$), the colors of each ball.
The second line contains $N$ integers $C_i$ $0 ≤ C_i < N$, the colors of each ball.
The third line contains $N-1$ integers: $P_i$ (with $1 ≤ i < N$) is the index of the parent of the $i$-th node.
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