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# Answering D1 Algorithm Questions watch

1. --
2. you need to show sufficient working to show you have used the right method e.g. with prims I think its sufficient to show what order you added the arcs in.
3. (Original post by Dom K. Jordan)
Ok, in D1, if you're asked to find something (minimum spanning tree, etc, whatever) by applying a specific Algorithm - how much working are you expected to show?

Let's say you're using Prim's algorithm from a network, do you have to actually write out each step i.e. "add vertex e" etc, and draw the graph at each stage, or would just the final result suffice. How would you get full marks in this case?
For Prim's and Kruskal's you have to note the order in which you add the arcs.

In Dijkstra's algorithm you have to show the crossing out at the nodes as you find quicker paths. They will always give you a figure on which to do this.

I can't remeber the others but as a rule of thumb, always note down the order in which you do everything.
4. Normally, you should just list the edges and show total weight.
5. I don't think you need to do all that, at least I didn't last year. Just list all edges, then write the order you added the vertices in, draw the tree and write the total weight in units (don't forget the units, easy way to lose a mark).
6. I dropped one mark on the paper so I would say that my methods work.

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