public override void Solve(IOManager io)
{
var n = io.ReadInt();
var tree = new BasicGraph(n);
for (int i = 0; i < n - 1; i++)
{
var u = io.ReadInt();
var v = io.ReadInt();
u--;
v--;
tree.AddEdge(u, v);
tree.AddEdge(v, u);
}
var lca = new LowestCommonAncester(tree);
var queries = io.ReadInt();
for (int q = 0; q < queries; q++)
{
var a = io.ReadInt() - 1;
var b = io.ReadInt() - 1;
io.WriteLine(lca.Depths[a] + lca.Depths[b] - 2 * lca.Depths[lca.GetLcaNode(a, b)] + 1);
}
}
public override void Solve(IOManager io)
{
var n = io.ReadInt();
var tree = new BasicGraph(n);
var root = -1;
for (int i = 0; i < n; i++)
{
var p = io.ReadInt();
if (p == -1)
{
root = i;
}
else
{
p--;
tree.AddEdge(p, i);
}
}
var lca = new LowestCommonAncester(tree, root);
var queries = io.ReadInt();
for (int q = 0; q < queries; q++)
{
var staff = io.ReadInt() - 1;
var boss = io.ReadInt() - 1;
if (lca.GetLcaNode(staff, boss) == boss)
{
io.WriteLine("Yes");
}
else
{
io.WriteLine("No");
}
}
}