feat: solve day 1 puzzle 2

src/day01/puzzle2.lua

@@ -1,7 +1,31 @@
+local utils = require "utils"
 local puzzle2 = {}
 
 function puzzle2.solve(input)
-    return 0
+    local password = 0
+    local cursor = 50
+    
+    local lines = utils.splitLines(input)
+    for _, line in ipairs(lines) do
+        local dir = line:sub(1, 1)
+        local dist = tonumber(line:sub(2))
+        if dir == "R" then
+            cursor = cursor + dist
+            if cursor > 99 then
+                password = password + math.floor(cursor / 100)
+            end
+        else
+            cursor = cursor - dist
+            if cursor <= 0 then
+                if cursor ~= -dist then
+                    password = password + 1
+                end
+                password = password + math.floor(-cursor / 100)
+            end
+        end
+        cursor = cursor % 100
+    end
+    return password
 end
 
 return puzzle2