day 19 part 2
This commit is contained in:
Felix Van der Jeugt
parent
76bdf2cfdd
commit
f4227e42ec
173
day19/part2.lua
Executable file
173
day19/part2.lua
Executable file
@ -0,0 +1,173 @@
|
||||
#!/usr/bin/env luajit
|
||||
require("utils")
|
||||
require("pqueue")
|
||||
|
||||
local scanners = {}
|
||||
local scanner = {}
|
||||
for line in io.lines(arg[3]) do
|
||||
if #line == 0 then
|
||||
table.insert(scanners, scanner)
|
||||
scanner = {}
|
||||
elseif char(line, 2) == "-" then
|
||||
else
|
||||
local x, y, z = unpack(split(line, ","))
|
||||
local beacon = { x = tonumber(x)
|
||||
, y = tonumber(y)
|
||||
, z = tonumber(z) }
|
||||
-- , q = pqueue() }
|
||||
table.insert(scanner, beacon)
|
||||
end
|
||||
end
|
||||
table.insert(scanners, scanner)
|
||||
|
||||
for _, scanner in pairs(scanners) do
|
||||
for i = 1, #scanner do
|
||||
for j = i + 1, #scanner do
|
||||
local d = (scanner[i].x - scanner[j].x) ^ 2
|
||||
+ (scanner[i].y - scanner[j].y) ^ 2
|
||||
+ (scanner[i].z - scanner[j].z) ^ 2
|
||||
-- scanner[i].q:add(d)
|
||||
-- if #scanner[i].q.items > 4 then scanner[i].q:pop() end
|
||||
-- scanner[j].q:add(d); scanner[j].q:pop()
|
||||
-- if #scanner[j].q.items > 4 then scanner[j].q:pop() end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
local function minp(a, b)
|
||||
return { x = a.x - b.x, y = a.y - b.y, z = a.z - b.z }
|
||||
end
|
||||
|
||||
local function addp(a, b)
|
||||
return { x = a.x + b.x, y = a.y + b.y, z = a.z + b.z }
|
||||
end
|
||||
|
||||
local rotations = { function(p) return { x = p.x, y = p.y, z = p.z } end
|
||||
, function(p) return { x = p.x, y = p.z, z = -p.y } end
|
||||
, function(p) return { x = p.x, y = -p.y, z = -p.z } end
|
||||
, function(p) return { x = p.x, y = -p.z, z = p.y } end
|
||||
, function(p) return { x = p.y, y = -p.x, z = p.z } end
|
||||
, function(p) return { x = p.y, y = p.z, z = p.x } end
|
||||
, function(p) return { x = p.y, y = p.x, z = -p.z } end
|
||||
, function(p) return { x = p.y, y = -p.z, z = -p.x } end
|
||||
, function(p) return { x = -p.x, y = -p.y, z = p.z } end
|
||||
, function(p) return { x = -p.x, y = -p.z, z = -p.y } end
|
||||
, function(p) return { x = -p.x, y = p.y, z = -p.z } end
|
||||
, function(p) return { x = -p.x, y = p.z, z = p.y } end
|
||||
, function(p) return { x = -p.y, y = p.x, z = p.z } end
|
||||
, function(p) return { x = -p.y, y = -p.z, z = p.x } end
|
||||
, function(p) return { x = -p.y, y = -p.x, z = -p.z } end
|
||||
, function(p) return { x = -p.y, y = p.z, z = -p.x } end
|
||||
, function(p) return { x = p.z, y = p.y, z = -p.x } end
|
||||
, function(p) return { x = p.z, y = p.x, z = p.y } end
|
||||
, function(p) return { x = p.z, y = -p.y, z = p.x } end
|
||||
, function(p) return { x = p.z, y = -p.x, z = -p.y } end
|
||||
, function(p) return { x = -p.z, y = -p.y, z = -p.x } end
|
||||
, function(p) return { x = -p.z, y = -p.x, z = p.y } end
|
||||
, function(p) return { x = -p.z, y = p.y, z = p.x } end
|
||||
, function(p) return { x = -p.z, y = p.x, z = -p.y } end
|
||||
}
|
||||
|
||||
local function eqp(a, b)
|
||||
return a.x == b.x and a.y == b.y and a.z == b.z
|
||||
end
|
||||
|
||||
local function rotate(a, r)
|
||||
local b = {}
|
||||
for _, p in pairs(a) do
|
||||
table.insert(b, r(p))
|
||||
end
|
||||
return b
|
||||
end
|
||||
|
||||
local function move(a, d)
|
||||
local b = {}
|
||||
for _, p in pairs(a) do
|
||||
table.insert(b, { x = p.x + d.x
|
||||
, y = p.y + d.y
|
||||
, z = p.z + d.z })
|
||||
end
|
||||
return b
|
||||
end
|
||||
|
||||
local function similar(a, b)
|
||||
local counter = 0
|
||||
for i, pa in pairs(a) do
|
||||
for j, pb in pairs(b) do
|
||||
if eqp(pa, pb) then
|
||||
counter = counter + 1
|
||||
break
|
||||
end
|
||||
end
|
||||
if counter >= 12 then
|
||||
return counter
|
||||
end
|
||||
end
|
||||
return 0
|
||||
end
|
||||
|
||||
function compare(a, b)
|
||||
for _, r in pairs(rotations) do
|
||||
local br = rotate(b, r)
|
||||
for _, pa1 in pairs(a) do
|
||||
for _, pb1 in pairs(br) do
|
||||
local d = minp(pa1, pb1)
|
||||
local b_ = move(br, d)
|
||||
if similar(a, b_) >= 12 then
|
||||
return b_, d
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
return nil
|
||||
end
|
||||
|
||||
local beacons = {}
|
||||
local counter = 0
|
||||
local function countbeacons(scanner)
|
||||
for _, b in pairs(scanner) do
|
||||
local xs = beacons[b.x] or {}
|
||||
local ys = xs[b.y] or {}
|
||||
if ys[b.z] == nil then
|
||||
ys[b.z] = true
|
||||
counter = counter + 1
|
||||
end
|
||||
xs[b.y] = ys
|
||||
beacons[b.x] = xs
|
||||
end
|
||||
end
|
||||
|
||||
local compareWiths = { scanners[1] }
|
||||
local todos = { unpack(scanners, 2) }
|
||||
local locations = { { x=0, y=0, z=0 } }
|
||||
while #todos > 0 do
|
||||
print(#todos)
|
||||
local newCompareWiths = {}
|
||||
local newtodos = {}
|
||||
for _, todo in pairs(todos) do
|
||||
local found, d = nil
|
||||
for _, compareWith in pairs(compareWiths) do
|
||||
found, d = compare(compareWith, todo)
|
||||
if found then break end
|
||||
end
|
||||
if found then
|
||||
table.insert(newCompareWiths, found)
|
||||
table.insert(locations, d)
|
||||
else
|
||||
table.insert(newtodos, todo)
|
||||
end
|
||||
end
|
||||
todos = newtodos
|
||||
compareWiths = newCompareWiths
|
||||
end
|
||||
|
||||
local max = 0
|
||||
for i = 1, #locations do
|
||||
for j = i + 1, #locations do
|
||||
local d = math.abs(locations[i].x - locations[j].x)
|
||||
+ math.abs(locations[i].y - locations[j].y)
|
||||
+ math.abs(locations[i].z - locations[j].z)
|
||||
if d > max then max = d end
|
||||
end
|
||||
end
|
||||
print(max)
|
||||
Loading…
Reference in New Issue
Block a user