did day 1 in lua for fun

2024/day1/main.lua

@@ -0,0 +1,57 @@
+-- Parse Input
+
+local file = io.open("input.text", "r")
+
+io.input(file)
+
+local left = {}
+local right = {}
+
+local i = 1
+while true do
+    local line = io.read()
+
+    if line == nil then break end
+
+    local l = true
+    for str in string.gmatch(line, "%S+") do
+        if l then
+            left[i] = tonumber(str)
+            l = not l
+        else
+            right[i] = tonumber(str)
+            i = i + 1
+        end
+    end
+
+end
+
+-- Part 1
+
+table.sort(left)
+table.sort(right)
+
+local total = 0
+for i, n in ipairs(left) do
+    total = total + math.abs(n - right[i])
+end
+
+print("Part 1: "..total)
+
+-- Part 2
+function count(a, m)
+    local c = 0
+    for _, n in ipairs(a) do
+        if n == m then
+            c = c + 1
+        end
+    end
+    return c
+end
+
+total = 0
+for i, n in ipairs(left) do
+    total = total + (n * count(right, n))
+end
+
+print("Part 2: "..total)