SP16580 QTREE7 - Query on a tree VII

You are given a tree (an acyclic undirected connected graph) with $n$ nodes. The tree nodes are numbered from $1$ to $n$. Each node has a color, white or black, and a weight. We will ask you to perfrom some instructions of the following form: - `0 u`: ask for the maximum weight among the nodes which are connected to $u$, two nodes are connected if all the node on the path from $u$ to $v$ (inclusive $u$ and $v$) have a same color. - `1 u`: toggle the color of $u$(that is, from black to white, or from white to black). - `2 u w`: change the weight of $u$ to $w$.

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