From 472634054f24edb7161ae94bc2869f7117eed196 Mon Sep 17 00:00:00 2001
From: LordBaryhobal <lordbaryhobal@gmail.com>
Date: Sun, 7 Dec 2025 13:44:31 +0100
Subject: [PATCH] feat: solve day 7 puzzle 2

---
 README.md             |  4 ++--
 res/stats.json        |  2 +-
 src/day07/puzzle2.lua | 32 +++++++++++++++++++++++++++++++-
 3 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 6189714..4937af2 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,10 @@ This project can also be run using the amazing [CraftOS-PC emulator](https://git
 ## Progress
 
 <!-- calendar-start -->
-#### Stars: 13/24
+#### Stars: 14/24
 
 |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:|
+|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>|9<br>|10<br>|11<br>|12<br>|||
 <!-- calendar-end -->
diff --git a/res/stats.json b/res/stats.json
index ed7de2d..1191135 100644
--- a/res/stats.json
+++ b/res/stats.json
@@ -25,7 +25,7 @@
     },
     "day07": {
         "puzzle1": true,
-        "puzzle2": false
+        "puzzle2": true
     },
     "day08": {
         "puzzle1": false,
diff --git a/src/day07/puzzle2.lua b/src/day07/puzzle2.lua
index 2f4bc9a..e8e0482 100644
--- a/src/day07/puzzle2.lua
+++ b/src/day07/puzzle2.lua
@@ -1,7 +1,37 @@
+local utils = require "utils"
+
 local puzzle2 = {}
 
 function puzzle2.solve(input)
-    return 0
+    local lines = utils.splitLines(input)
+
+    local beams = {}
+
+    for i, line in ipairs(lines) do
+        local newBeams = {}
+        if i == 1 then
+            newBeams[line:find("S")] = 1
+        else
+            for j=1, #line do
+                if beams[j] then
+                    if line:sub(j, j) == "^" then
+                        newBeams[j - 1] = (newBeams[j - 1] or 0) + beams[j]
+                        newBeams[j + 1] = (newBeams[j + 1] or 0) + beams[j]
+                    else
+                        newBeams[j] = (newBeams[j] or 0) + beams[j]
+                    end
+                end
+            end
+        end
+        beams = newBeams
+    end
+
+    local finalBeams = 0
+    for _, v in pairs(beams) do
+        finalBeams = finalBeams + v
+    end
+
+    return finalBeams
 end
 
 return puzzle2