Created
March 5, 2021 23:14
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| L=11 | |
| @field = Array.new(32*32) {0} | |
| @vecs = [[1,0], [0,-1], [-1,0], [0,1]] | |
| def fld(x,y) @field[y*32+x] end | |
| def set(x,y,v) @field[y*32+x] = v end | |
| def step(x, y, ang) | |
| vx,vy = @vecs[ang & 3] | |
| return x+vx, y+vy | |
| end | |
| @dna = Array.new(L) | |
| @path = Array.new(L) {[16,16]} | |
| def cpn | |
| n = 0 | |
| for p in @path do | |
| if fld(p[0], p[1])==1 then | |
| n += 1 if fld(p[0]+1, p[1])==1 | |
| n += 1 if fld(p[0], p[1]+1)==1 | |
| end | |
| end | |
| n | |
| end | |
| def draw(n, x,y, angle) | |
| return if fld(x,y) != 0 | |
| set(x,y, @dna[n]) | |
| @path[n][0] = x; @path[n][1] = y | |
| if n == L-1 then | |
| cp = cpn() | |
| @maxcpn = cp if cp > @maxcpn | |
| set(x,y, 0) | |
| return | |
| end | |
| nx,ny = step(x,y, angle) | |
| draw(n+1, nx,ny, angle) | |
| nx,ny = step(x,y, angle-1) | |
| draw(n+1, nx,ny, (angle-1)&3) | |
| nx,ny = step(x,y, angle+1) | |
| draw(n+1, nx,ny, (angle+1)&3) | |
| set(x,y, 0) | |
| end | |
| def optLen(seed) | |
| for i in (0...L) do | |
| @dna[i] = if (seed & (1 << i)) > 0 then 2 else 1 end | |
| end | |
| set(16,16, @dna[0]) | |
| @maxcpn = 0 | |
| draw(1, 17,16, 0) | |
| @maxcpn | |
| end | |
| puts (0...(1<<L)).map{|i| optLen(i)}.reduce(:+) |
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