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back to boardI don't understand this problem. As I think, the third sample is the tree from the picture. But I can not understand why, for example, 'the number of the ancestor of this node' for the node #18 is 12? What does it mean, 'the number of the ancestor of this node'?
THank you. As you can see in a picture, the node #18 connected with the #12 node, and
- #18 is a child for #12;
- #12 is a ancestor, farther (mother) of #18.
In phrase "the number of the ancestor of this node" the word "number" should be understood ad index (the index of the node, which is an ancestor for target node). |
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