feat: solve day 11 puzzle 2

README.md

@@ -8,10 +8,10 @@ This project can also be run using the amazing [CraftOS-PC emulator](https://git
 ## Progress
 
 <!-- calendar-start -->
-#### Stars: 16/24
+#### Stars: 20/24
 
 |Mon|Tue|Wed|Thu|Fri|Sat|Sun|
 |:-:|:-:|:-:|:-:|:-:|:-:|:-:|
 |1<br>:star::star:|2<br>:star::star:|3<br>:star::star:|4<br>:star::star:|5<br>:star::star:|6<br>:star::star:|7<br>:star::star:|
-|8<br>:star::star:|9<br>|10<br>|11<br>|12<br>|||
+|8<br>:star::star:|9<br>:star:|10<br>:star:|11<br>:star::star:|12<br>|||
 <!-- calendar-end -->

res/examples/day09.txt

@@ -0,0 +1,8 @@
+7,1
+11,1
+11,7
+9,7
+9,5
+2,5
+2,3
+7,3

res/examples/day10.txt

@@ -0,0 +1,3 @@
+[.##.] (3) (1,3) (2) (2,3) (0,2) (0,1) {3,5,4,7}
+[...#.] (0,2,3,4) (2,3) (0,4) (0,1,2) (1,2,3,4) {7,5,12,7,2}
+[.###.#] (0,1,2,3,4) (0,3,4) (0,1,2,4,5) (1,2) {10,11,11,5,10,5}

res/examples/day11.txt

@@ -0,0 +1,13 @@
+svr: aaa bbb
+aaa: fft
+fft: ccc
+bbb: tty
+tty: ccc
+ccc: ddd eee
+ddd: hub
+hub: fff
+eee: dac
+dac: fff
+fff: ggg hhh
+ggg: out
+hhh: out

res/examples/day11_1.txt

@@ -0,0 +1,10 @@
+aaa: you hhh
+you: bbb ccc
+bbb: ddd eee
+ccc: ddd eee fff
+ddd: ggg
+eee: out
+fff: out
+ggg: out
+hhh: ccc fff iii
+iii: out

res/stats.json

@@ -32,16 +32,16 @@
         "puzzle2": true
     },
     "day09": {
-        "puzzle1": false,
+        "puzzle1": true,
         "puzzle2": false
     },
     "day10": {
-        "puzzle1": false,
+        "puzzle1": true,
         "puzzle2": false
     },
     "day11": {
-        "puzzle1": false,
+        "puzzle1": true,
-        "puzzle2": false
+        "puzzle2": true
     },
     "day12": {
         "puzzle1": false,

src/day09/puzzle1.lua

@@ -0,0 +1,30 @@
+local utils = require "utils"
+local puzzle1 = {}
+
+function puzzle1.area(tile1, tile2)
+    local dx = math.abs(tile2.x - tile1.x) + 1
+    local dy = math.abs(tile2.y - tile1.y) + 1
+    return dx * dy
+end
+
+function puzzle1.solve(input)
+    local lines = utils.splitLines(input)
+    local tiles = {}
+
+    for _, line in ipairs(lines) do
+        local x, y = line:match("(%d+),(%d+)")
+        table.insert(tiles, {x=tonumber(x), y=tonumber(y)})
+    end
+
+    local maxArea = 0
+    for i, tile1 in ipairs(tiles) do
+        for j=i+1, #tiles do
+            local tile2 = tiles[j]
+            local area = puzzle1.area(tile1, tile2)
+            maxArea = math.max(maxArea, area)
+        end
+    end
+    return maxArea
+end
+
+return puzzle1

src/day09/puzzle2.lua

@@ -0,0 +1,7 @@
+local puzzle2 = {}
+
+function puzzle2.solve(input)
+    return 0
+end
+
+return puzzle2

src/day10/puzzle1.lua

@@ -0,0 +1,88 @@
+local strings = require "cc.strings"
+local utils = require "utils"
+local puzzle1 = {}
+
+function puzzle1.parseMachine(line)
+    local lightsStr = line:match("%[([.#]+)%]")
+    local buttonsStr = strings.split(line:match(" (.+) "), " ")
+
+    local lightsBools = {}
+    local lightsVal = 0
+    for i=1, #lightsStr do
+        local c = lightsStr:sub(i, i)
+        lightsBools[i] = c == "#"
+        if c == "#" then
+            local pow = bit.blshift(1, i - 1)
+            lightsVal = lightsVal + pow
+        end
+    end
+
+    local buttons = {}
+
+    for _, btnStr in ipairs(buttonsStr) do
+        local lights = {}
+        local value = 0
+        for n in btnStr:gmatch("%d+") do
+            local v = tonumber(n)
+            table.insert(lights, v)
+            value = value + bit.blshift(1, v)
+        end
+        table.insert(buttons, {
+            lights=lights,
+            value=value,
+            presses=0
+        })
+    end
+
+    return {
+        lightsBools=lightsBools,
+        lightsVal=lightsVal,
+        buttons=buttons
+    }
+end
+
+function puzzle1.startMachine(target, btns)
+    local queue = {{value=0, presses=0, used=0}}
+    local cache = {}
+    while #queue ~= 0 do
+        local test = table.remove(queue, 1)
+        local key = tostring(test.value) .. "-" .. tostring(test.used)
+        if not cache[key] then
+            cache[key] = true
+            if test.value == target then
+                return test.presses
+            end
+            for i=(test.presses + 1), #btns do
+                local pow = bit.blshift(1, i - 1)
+                if bit.band(test.used, pow) == 0 then
+                    table.insert(queue, {
+                        value=bit.bxor(test.value, btns[i].value),
+                        presses=test.presses + 1,
+                        used=test.used + pow
+                    })
+                end
+            end
+        end
+    end
+    print("Could not find valid button combination")
+    return -1
+end
+
+function puzzle1.solve(input)
+    local lines = utils.splitLines(input)
+    local machines = {}
+    for _, line in ipairs(lines) do
+        table.insert(machines, puzzle1.parseMachine(line))
+    end
+
+    local totalPresses = 0
+
+    for i, machine in ipairs(machines) do
+        print("Machine " .. tostring(i) .. "/" .. tostring(#machines))
+        totalPresses = totalPresses + puzzle1.startMachine(machine.lightsVal, machine.buttons)
+    end
+
+    return totalPresses
+end
+
+return puzzle1

src/day10/puzzle2.lua

@@ -0,0 +1,7 @@
+local puzzle2 = {}
+
+function puzzle2.solve(input)
+    return 0
+end
+
+return puzzle2

src/day11/puzzle1.lua

@@ -0,0 +1,36 @@
+local strings = require "cc.strings"
+local utils = require "utils"
+local puzzle1 = {}
+
+local cache = {}
+
+function puzzle1.countPaths(edges, startDev, endDev)
+    local key = startDev .. "-" .. endDev
+    if cache[key] then
+        return cache[key]
+    end
+    if startDev == endDev then
+        return 1
+    end
+    local outs = edges[startDev]
+    local total = 0
+    for _, out in ipairs(outs) do
+        total = total + puzzle1.countPaths(edges, out, endDev)
+    end
+    cache[key] = total
+    return total
+end
+
+function puzzle1.solve(input)
+    local lines = utils.splitLines(input)
+    local outputs = {}
+
+    for _, line in ipairs(lines) do
+        local device, outs = line:match("(.+): (.+)")
+        outputs[device] = strings.split(outs, " ")
+    end
+
+    return puzzle1.countPaths(outputs, "you", "out")
+end
+
+return puzzle1

src/day11/puzzle2.lua

@@ -0,0 +1,49 @@
+local strings = require "cc.strings"
+local utils = require "utils"
+local puzzle2 = {}
+
+local cache = {}
+
+function puzzle2.countPaths(edges, startDev, endDev, dac, fft)
+    dac = dac or false
+    fft = fft or false
+    local key = startDev .. "-" .. endDev .. "-" .. tostring(dac) .. "-" .. tostring(fft)
+    if cache[key] then
+        return cache[key]
+    end
+    if startDev == endDev then
+        if dac and fft then
+            return 1
+        else
+            return 0
+        end
+    end
+    local outs = edges[startDev]
+    local total = 0
+    for _, out in ipairs(outs) do
+        local dac2 = dac
+        local fft2 = fft
+        if out == "dac" then
+            dac2 = true
+        elseif out == "fft" then
+            fft2 = true
+        end
+        total = total + puzzle2.countPaths(edges, out, endDev, dac2, fft2)
+    end
+    cache[key] = total
+    return total
+end
+
+function puzzle2.solve(input)
+    local lines = utils.splitLines(input)
+    local outputs = {}
+
+    for _, line in ipairs(lines) do
+        local device, outs = line:match("(.+): (.+)")
+        outputs[device] = strings.split(outs, " ")
+    end
+
+    return puzzle2.countPaths(outputs, "svr", "out")
+end
+
+return puzzle2