2020 day 1

2020/1/day1.lua

@@ -0,0 +1,32 @@
+#!/usr/bin/env lua
+-- I'm feeling lazy.
+local numbers = {}
+
+for line in io.lines() do
+    table.insert(numbers, tonumber(line))
+end
+
+local function part1()
+    for _, x in ipairs(numbers) do
+        for _, y in ipairs(numbers) do
+            if x + y == 2020 then
+                return x * y
+            end
+        end
+    end
+end
+
+local function part2()
+    for _, x in ipairs(numbers) do
+        for _, y in ipairs(numbers) do
+            for _, z in ipairs(numbers) do
+                if x + y + z == 2020 then
+                    return x * y * z
+                end
+            end
+        end
+    end
+end
+
+print(part1())
+print(part2())

README.md

@@ -5,8 +5,8 @@ My solutions to the Advent of Code puzzles.
 ## Progress
 
 ```
-   15 16 17 18 19
- 1 ██ ██ ██ ██
+   15 16 17 18 19 20
+ 1 ██ ██ ██ ██    ██
  2 ██ ██ ██ ██
  3 ██ ██ ██ ██
  4 ██    ██ ██