20 lines
634 B
Text
20 lines
634 B
Text
func spiral(n) {
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var (x, y, dx, dy, a) = (0, 0, 1, 0, [])
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{ |i|
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a[y][x] = i
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var (nx, ny) = (x+dx, y+dy)
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( if (dx == 1 && (nx == n || a[ny][nx]!=nil)) { [ 0, 1] }
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elsif (dy == 1 && (ny == n || a[ny][nx]!=nil)) { [-1, 0] }
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elsif (dx == -1 && (nx < 0 || a[ny][nx]!=nil)) { [ 0, -1] }
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elsif (dy == -1 && (ny < 0 || a[ny][nx]!=nil)) { [ 1, 0] }
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else { [dx, dy] }
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) » (\dx, \dy)
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x = x+dx
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y = y+dy
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} << (1 .. n**2)
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return a
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}
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spiral(5).each { |row|
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row.map {"%3d" % _}.join(' ').say
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}
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