64 lines
1.9 KiB
Julia
64 lines
1.9 KiB
Julia
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include("utils.jl")
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function parse_input(filename)
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map(x->parse.(Int, x), split.(non_empty_lines(filename), ""))
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end
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function search(entry_risk)
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width, height = size(entry_risk)
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total_risk = fill(typemax(Int64), width, height)
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total_risk[1, 1] = 0
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to_visit = [(CartesianIndex(1,2), 0), (CartesianIndex(2,1), 0)]
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while length(to_visit) > 0
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rounds += 1
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coord, cost = popfirst!(to_visit)
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cost += entry_risk[coord]
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if cost < total_risk[coord]
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total_risk[coord] = cost
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if coord[1] > 1
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push!(to_visit, (CartesianIndex(coord[1] - 1, coord[2]), cost))
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end
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if coord[1] < width
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push!(to_visit, (CartesianIndex(coord[1] + 1, coord[2]), cost))
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end
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if coord[2] > 1
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push!(to_visit, (CartesianIndex(coord[1], coord[2] - 1), cost))
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end
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if coord[2] < height
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push!(to_visit, (CartesianIndex(coord[1], coord[2] + 1), cost))
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end
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end
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end
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total_risk[width, height]
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end
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function solution15_1()
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entry_risk = parse_input("15.data")
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width = length(entry_risk)
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height = length(entry_risk[1])
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entry_risk = transpose(reshape(reduce(vcat, entry_risk), height, width))
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search(entry_risk)
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end
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function solution15_2()
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entry_risk = parse_input("15.data")
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width = length(entry_risk)
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height = length(entry_risk[1])
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entry_risk = map(entry_risk) do line
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[line;
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map(x->mod((x-1)+1, 9)+1, line);
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map(x->mod((x-1)+2, 9)+1, line);
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map(x->mod((x-1)+3, 9)+1, line);
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map(x->mod((x-1)+4, 9)+1, line);
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]
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end
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for _ in 1:(4*height)
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push!(entry_risk, map(x->mod((x-1)+1, 9)+1, entry_risk[length(entry_risk) - (height - 1)]))
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end
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entry_risk = transpose(reshape(reduce(vcat, entry_risk), height*5, width*5))
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search(entry_risk)
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end
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solution15_2()
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