65 lines
1.4 KiB
Plaintext
65 lines
1.4 KiB
Plaintext
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)get "input.ivy"
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sample = 7 7 rho '....#..' '..###.#' '#...#.#' '.#...##' '#.###..' '##.#.##' '.#..#..'
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board = sample == '#'
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#board
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op north a = 1 flip a
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op south a = -1 flip a
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op west a = 1 rot a
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op east a = -1 rot a
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#north 3 3 rho iota 9
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op a coalesce b =
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a: a
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b
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op any a = or/,a
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op pad a = 0,(transp (0,(transp a),0)),0
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op needsPad a = (any 0 != a[1,(rho a)[1]]) or (any 0 != a[;(1,(rho a)[2])])
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op maybePad a =
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needsPad a: pad a
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a
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op smearWE a = a or (west a) or (east a)
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op smearNS a = a or (north a) or (south a)
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op lift a = (1,rho a) rho a
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op show a = (text ".#23456789"[1+a]),"\n-"
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M = 0
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a = maybePad board
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n = south smearWE a
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s = north smearWE a
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e = west smearNS a
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w = east smearNS a
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#n
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p = 4 3 2 1
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C = (lift n) , (lift s) , (lift w) , (lift e)
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rho C
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canMove = a and or/ 3 1 2 transp C # can move if there is an elf nearby
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C2 = (not C) and (rho C) rho canMove # can move in a direction if not alone and there is no elf in that direction
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show C2
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P1 = max/ p * 3 1 2 transp C2 # select direction
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P2 = p o.== P1 # decompose into 4x?x? matrix
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P1; "\n-"
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C3 = (north P2[1]) + (south P2[2]) + (west P2[3]) + (east P2[4])
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C3; "\n-"
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notBlock = C3 == 1
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C4 = (lift south notBlock), (lift north notBlock), (lift east notBlock), (lift west notBlock)
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rho C4
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P3 = P2 and C4
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show P3
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moved = or/ 3 1 2 transp P3
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moved
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#a and not moved
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#show P3
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B = (a and not moved) + (north P3[1]) + (south P3[2]) + (west P3[3]) + (east P3[4])
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show a
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show B
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