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Add day 20
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‎2021/20/20.jl

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function main()
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asbin(s) = Int.(collect(s) .== '#') |> join
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lookup = readline() |> asbin
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readline()
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lines = readlines() .|> asbin
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default = '0'
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for iteration in 1:50
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sy, sx = length(lines), length(lines[1])
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atmap(y, x) = (y ∈ 1:sy && x ∈ 1:sx) ? lines[y][x] : default
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expanded = []
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for Y = 0:sy+1
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push!(expanded, [])
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for X = 0:sx+1
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index = parse(Int, join(atmap(Y+y, X+x) for x=-1:1, y=-1:1), base=2)
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push!(expanded[end], lookup[index + 1])
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end
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end
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lines = expanded
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default = (default == '0') ? lookup[1] : lookup[end]
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iteration ∈ [2, 50] && println(lines .|> (line -> line .== '1') |> sum |> sum)
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end
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end
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main()

‎2021/20/example.ans

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‎2021/20/example.in

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#..#.
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#....
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##..#
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..###

‎2021/20/input.ans

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‎2021/20/input.in

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‎init-day.sh

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@@ -26,15 +26,15 @@ if [[ "$1" ]]; then
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input_ans_file="${input_prefix}.ans"
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if ! [[ -f "$input_ans_file" ]]; then
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echo "Create empty input answer file"
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echo "<answer>" > "$input_ans_file"
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touch "$input_ans_file"
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fi
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# Prepare dummy python solution
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solution_file="$1.py"
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if ! [[ -f "$solution_file" ]]; then
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echo "Create dummy python solution $solution_file"
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cp "../dummy.py" "$solution_file"
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fi
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# solution_file="$1.py"
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# if ! [[ -f "$solution_file" ]]; then
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# echo "Create dummy python solution $solution_file"
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# cp "../dummy.py" "$solution_file"
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# fi
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nvim "$solution_file" "${sample_prefix}.in" "${sample_prefix}.ans" -c "norm G$"

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