feat: solve day 7 puzzle 1

src/day07/puzzle1.lua

@@ -0,0 +1,34 @@
+local utils = require "utils"
+
+local puzzle1 = {}
+
+function puzzle1.solve(input)
+    local lines = utils.splitLines(input)
+
+    local beams = {}
+    local totalSplits = 0
+
+    for i, line in ipairs(lines) do
+        local newBeams = {}
+        if i == 1 then
+            newBeams[line:find("S")] = true
+        else
+            for j=1, #line do
+                if beams[j] then
+                    if line:sub(j, j) == "^" then
+                        totalSplits = totalSplits + 1
+                        newBeams[j - 1] = true
+                        newBeams[j + 1] = true
+                    else
+                        newBeams[j] = true
+                    end
+                end
+            end
+        end
+        beams = newBeams
+    end
+
+    return totalSplits
+end
+
+return puzzle1

src/day07/puzzle2.lua

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