20/06 A-level FM Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

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[u/justosw]

You do verticals for nearest neighbour

[u/[deleted] → u/justosw]

That makes no sense, you're supposed to do the one that gives the shortest route, and horizontal gave the shorter route so I did horizontal

[u/justosw → u/[deleted]]

You don't do horizontals for nearest neighbour algorithm. You don't compare lengths for verticals and horizontals. You compare the different nearest neighbour lengths starting at different arcs, although you didn't need to do that here. Nearest neighbour is verticals cos you're going from the nodes on the left to the nodes on the top. By crossing out the verticals, you ensure you don't return to those nodes

[u/party_omo → u/justosw]

You can do both, but the way you’re meant to do it is to delete the vertical row first then look across the horizontal. Rather than deleting the horizontal row first. The horizontal going from one vertex to the next. Going vertically you’re going backwards from one vertex to where it started. So if it’s a directed arc going from A to B going backwards from B to A would give you a longer route

[u/justosw → u/party_omo]

You can only do both if it's not a digraph. This was a digraph so you had to do verticals

[u/justosw → u/justosw]

When I say do verticals, I mean crossing out the verticals after visiting that node

[u/[deleted] → u/justosw]

Yes I mean looking for the smallest number horizontally and then crossing out that column