# Pov

Reparent a graph on a selected node

# Tree Reparenting

This exercise is all about re-orientating a graph to see things from a different
point of view. For example family trees are usually presented from the
ancestor's perspective:

```
    +------0------+
    |      |      |
  +-1-+  +-2-+  +-3-+
  |   |  |   |  |   |
  4   5  6   7  8   9

```

But the same information can be presented from the perspective of any other node
in the graph, by pulling it up to the root and dragging its relationships along
with it. So the same graph from 6's perspective would look like:

```
        6
        |
  +-----2-----+
  |           |
  7     +-----0-----+
        |           |
      +-1-+       +-3-+
      |   |       |   |
      4   5       8   9
```

This lets us more simply describe the paths between two nodes. So for example
the path from 6-9 (which in the first graph goes up to the root and then down to
a different leaf node) can be seen to follow the path 6-2-0-3-9

This exercise involves taking an input graph and re-orientating it from the point
of view of one of the nodes.

To run the tests simply run the command `go test` in the exercise directory.

If the test suite contains benchmarks, you can run these with the `-bench`
flag:

    go test -bench .

For more detailed info about the Go track see the [help
page](http://exercism.io/languages/go).

## Source

Adaptation of exercise from 4clojure [https://www.4clojure.com/](https://www.4clojure.com/)

## Submitting Incomplete Problems
It's possible to submit an incomplete solution so you can see how others have completed the exercise.