From 39a4bf3929118980e89cc48b05c7846fff5cb8ff Mon Sep 17 00:00:00 2001
From: Jan Krňávek <Jan.Krnavek@gmail.com>
Date: Sun, 8 Sep 2024 21:03:08 +0200
Subject: solution week 285-2 -- Elixir

---
 challenge-285/wambash/elixir/ch-2.exs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 challenge-285/wambash/elixir/ch-2.exs

diff --git a/challenge-285/wambash/elixir/ch-2.exs b/challenge-285/wambash/elixir/ch-2.exs
new file mode 100644
index 0000000000..499304306b
--- /dev/null
+++ b/challenge-285/wambash/elixir/ch-2.exs
@@ -0,0 +1,30 @@
+defmodule Change do
+  defp _making({0,_}),do: [1]
+  defp _making({_,[]}),do: [0]
+  defp _making({amount, [hc| coins]}) when hc > amount, do: _making({amount,coins})
+  defp _making({amount, coins}) do
+    coins
+    |> Enum.flat_map(fn
+      x -> _making(
+        {
+          amount - x,
+          coins |> Enum.drop_while( & &1 > x )
+        }
+      )
+    end)
+  end
+  def making(w) do
+    _making(w) |> Enum.sum
+  end
+end
+
+ExUnit.start()
+
+defmodule ChangeTest do
+  use ExUnit.Case
+  test "Change" do
+    assert Change.making({9,[50,25,10,5,1]})  == 2
+    assert Change.making({100,[50,25,10,5,1]}) == 292
+    assert Change.making({15,[50,25,10,5,1]})  == 6
+  end
+end
-- 
cgit