day 19 part 2
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Felix Van der Jeugt
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76bdf2cfdd
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f4227e42ec
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#!/usr/bin/env luajit
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require("utils")
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require("pqueue")
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local scanners = {}
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local scanner = {}
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for line in io.lines(arg[3]) do
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if #line == 0 then
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table.insert(scanners, scanner)
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scanner = {}
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elseif char(line, 2) == "-" then
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else
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local x, y, z = unpack(split(line, ","))
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local beacon = { x = tonumber(x)
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, y = tonumber(y)
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, z = tonumber(z) }
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-- , q = pqueue() }
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table.insert(scanner, beacon)
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end
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end
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table.insert(scanners, scanner)
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for _, scanner in pairs(scanners) do
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for i = 1, #scanner do
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for j = i + 1, #scanner do
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local d = (scanner[i].x - scanner[j].x) ^ 2
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+ (scanner[i].y - scanner[j].y) ^ 2
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+ (scanner[i].z - scanner[j].z) ^ 2
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-- scanner[i].q:add(d)
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-- if #scanner[i].q.items > 4 then scanner[i].q:pop() end
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-- scanner[j].q:add(d); scanner[j].q:pop()
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-- if #scanner[j].q.items > 4 then scanner[j].q:pop() end
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end
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end
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end
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local function minp(a, b)
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return { x = a.x - b.x, y = a.y - b.y, z = a.z - b.z }
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end
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local function addp(a, b)
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return { x = a.x + b.x, y = a.y + b.y, z = a.z + b.z }
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end
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local rotations = { function(p) return { x = p.x, y = p.y, z = p.z } end
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, function(p) return { x = p.x, y = p.z, z = -p.y } end
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, function(p) return { x = p.x, y = -p.y, z = -p.z } end
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, function(p) return { x = p.x, y = -p.z, z = p.y } end
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, function(p) return { x = p.y, y = -p.x, z = p.z } end
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, function(p) return { x = p.y, y = p.z, z = p.x } end
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, function(p) return { x = p.y, y = p.x, z = -p.z } end
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, function(p) return { x = p.y, y = -p.z, z = -p.x } end
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, function(p) return { x = -p.x, y = -p.y, z = p.z } end
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, function(p) return { x = -p.x, y = -p.z, z = -p.y } end
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, function(p) return { x = -p.x, y = p.y, z = -p.z } end
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, function(p) return { x = -p.x, y = p.z, z = p.y } end
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, function(p) return { x = -p.y, y = p.x, z = p.z } end
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, function(p) return { x = -p.y, y = -p.z, z = p.x } end
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, function(p) return { x = -p.y, y = -p.x, z = -p.z } end
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, function(p) return { x = -p.y, y = p.z, z = -p.x } end
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, function(p) return { x = p.z, y = p.y, z = -p.x } end
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, function(p) return { x = p.z, y = p.x, z = p.y } end
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, function(p) return { x = p.z, y = -p.y, z = p.x } end
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, function(p) return { x = p.z, y = -p.x, z = -p.y } end
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, function(p) return { x = -p.z, y = -p.y, z = -p.x } end
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, function(p) return { x = -p.z, y = -p.x, z = p.y } end
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, function(p) return { x = -p.z, y = p.y, z = p.x } end
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, function(p) return { x = -p.z, y = p.x, z = -p.y } end
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}
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local function eqp(a, b)
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return a.x == b.x and a.y == b.y and a.z == b.z
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end
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local function rotate(a, r)
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local b = {}
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for _, p in pairs(a) do
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table.insert(b, r(p))
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end
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return b
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end
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local function move(a, d)
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local b = {}
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for _, p in pairs(a) do
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table.insert(b, { x = p.x + d.x
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, y = p.y + d.y
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, z = p.z + d.z })
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end
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return b
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end
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local function similar(a, b)
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local counter = 0
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for i, pa in pairs(a) do
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for j, pb in pairs(b) do
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if eqp(pa, pb) then
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counter = counter + 1
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break
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end
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end
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if counter >= 12 then
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return counter
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end
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end
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return 0
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end
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function compare(a, b)
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for _, r in pairs(rotations) do
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local br = rotate(b, r)
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for _, pa1 in pairs(a) do
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for _, pb1 in pairs(br) do
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local d = minp(pa1, pb1)
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local b_ = move(br, d)
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if similar(a, b_) >= 12 then
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return b_, d
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end
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end
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end
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end
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return nil
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end
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local beacons = {}
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local counter = 0
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local function countbeacons(scanner)
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for _, b in pairs(scanner) do
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local xs = beacons[b.x] or {}
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local ys = xs[b.y] or {}
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if ys[b.z] == nil then
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ys[b.z] = true
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counter = counter + 1
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end
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xs[b.y] = ys
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beacons[b.x] = xs
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end
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end
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local compareWiths = { scanners[1] }
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local todos = { unpack(scanners, 2) }
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local locations = { { x=0, y=0, z=0 } }
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while #todos > 0 do
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print(#todos)
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local newCompareWiths = {}
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local newtodos = {}
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for _, todo in pairs(todos) do
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local found, d = nil
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for _, compareWith in pairs(compareWiths) do
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found, d = compare(compareWith, todo)
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if found then break end
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end
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if found then
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table.insert(newCompareWiths, found)
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table.insert(locations, d)
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else
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table.insert(newtodos, todo)
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end
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end
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todos = newtodos
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compareWiths = newCompareWiths
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end
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local max = 0
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for i = 1, #locations do
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for j = i + 1, #locations do
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local d = math.abs(locations[i].x - locations[j].x)
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+ math.abs(locations[i].y - locations[j].y)
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+ math.abs(locations[i].z - locations[j].z)
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if d > max then max = d end
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end
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end
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print(max)
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