feat: solve day 2 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: 3/24
+#### Stars: 4/24
 
 |Mon|Tue|Wed|Thu|Fri|Sat|Sun|
 |:-:|:-:|:-:|:-:|:-:|:-:|:-:|
-|1<br>:star::star:|2<br>:star:|3<br>|4<br>|5<br>|6<br>|7<br>|
+|1<br>:star::star:|2<br>:star::star:|3<br>|4<br>|5<br>|6<br>|7<br>|
 |8<br>|9<br>|10<br>|11<br>|12<br>|||
 <!-- calendar-end -->

res/stats.json

@@ -5,7 +5,7 @@
     },
     "day02": {
         "puzzle1": true,
-        "puzzle2": false
+        "puzzle2": true
     },
     "day03": {
         "puzzle1": false,

src/day02/puzzle2.lua

@@ -1,7 +1,46 @@
+local utils = require "utils"
+local puzzle1 = require(SRC_PATH .. "/day02/puzzle1")
 local puzzle2 = {}
 
+function puzzle2.isValid(id)
+    local str = tostring(id)
+    local totLen = #str
+    for len=1, totLen - 1 do
+        if totLen % len == 0 then
+            local ref = str:sub(1, len)
+            local allSame = true
+            for i=1, totLen / len - 1 do
+                if str:sub(len * i + 1, len * (i + 1)) ~= ref then
+                    allSame = false
+                    break
+                end
+            end
+            if allSame then
+                return false
+            end
+        end
+    end
+    return true
+end
+
+function puzzle2.countInvalids(range)
+    local min, max = puzzle1.splitRange(range)
+    local total = 0
+    for i=min, max do
+        if not puzzle2.isValid(i) then
+            total = total + i
+        end
+    end
+    return total
+end
+
 function puzzle2.solve(input)
-    return 0
+    local ranges = utils.split(input, ",")
+    local total = 0
+    for _, range in ipairs(ranges) do
+        total = total + puzzle2.countInvalids(range)
+    end
+    return total
 end
 
 return puzzle2