feat: solve day 11 puzzle 1

README.md

@@ -8,10 +8,10 @@ This project can also be run using the amazing [CraftOS-PC emulator](https://git
 ## Progress
 
 <!-- calendar-start -->
-#### Stars: 18/24
+#### Stars: 19/24
 
 |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>:star:|10<br>:star:|11<br>|12<br>|||
+|8<br>:star::star:|9<br>:star:|10<br>:star:|11<br>:star:|12<br>|||
 <!-- calendar-end -->

res/examples/day11.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

@@ -40,7 +40,7 @@
         "puzzle2": false
     },
     "day11": {
-        "puzzle1": false,
+        "puzzle1": true,
         "puzzle2": false
     },
     "day12": {

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