add 2024 day 1 livebook

elixir/livebook/2024/day1.livemd

@@ -0,0 +1,43 @@
+# AOC2024 Day 1
+
+## Section
+
+```elixir
+input = """
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3
+"""
+```
+
+```elixir
+{left, right} = for [a,b] <- input |> String.trim()
+|> String.split("\n")
+|> Enum.map(&(String.split(&1, "   ") |> Enum.map(fn s -> String.to_integer(s) end))),
+  reduce: {[],[]}
+do
+  {k,l} -> {[a|k],[b|l]}
+end
+```
+
+```elixir
+for {a, b} <- (left |> Enum.sort()) |> Enum.zip((right |> Enum.sort())),
+  reduce: 0 do
+  acc -> acc + abs(b - a)
+end
+```
+
+```elixir
+freq = right |> Enum.frequencies()
+```
+
+```elixir
+for n <- left,
+  f = Map.get(freq, n, 0),
+  reduce: 0 do
+  acc -> acc + n*f
+end
+```