Merge pull request #10069 from packy/master

Challenge 267 Guest solutions in Elixir by Packy Anderson

3 files changed, 97 insertions, 0 deletions

diff --git a/challenge-268/packy-anderson/README.md b/challenge-268/packy-anderson/README.md
index 736b69a97f..ef082e98a3 100644
--- a/challenge-268/packy-anderson/README.md
+++ b/challenge-268/packy-anderson/README.md
@@ -14,6 +14,10 @@
 * [Task 1](python/ch-1.py)
 * [Task 2](python/ch-2.py)
 
+## Guest Language: Elixir
+* [Task 1](elixir/ch-1.exs)
+* [Task 2](elixir/ch-2.exs)
+
 ## Blog Post
 
 [Let's do the Numbers!](https://packy.dardan.com/b/L6)
diff --git a/challenge-268/packy-anderson/elixir/ch-1.exs b/challenge-268/packy-anderson/elixir/ch-1.exs
new file mode 100755
index 0000000000..86099dac11
--- /dev/null
+++ b/challenge-268/packy-anderson/elixir/ch-1.exs
@@ -0,0 +1,53 @@
+#!/usr/bin/env elixir
+
+defmodule PWC do
+  defp checkNums(magic, [], []) do
+    { :ok, magic }
+  end
+
+  defp checkNums(magic, [x | rX], [y | rY]) do
+    if y - x == magic do
+      checkNums(magic, rX, rY)
+    else
+      { :err, 0 }
+    end
+  end
+
+  def magicNumber(x, y) do
+    xS = Enum.sort(x)
+    yS = Enum.sort(y)
+    magic = Enum.at(yS, 0) - Enum.at(xS, 0)
+    checkNums(magic, xS, yS)
+  end
+
+  def solution(x, y) do
+    IO.puts("Input: @x = (" <> Enum.join(x, ", ") <> ")")
+    IO.puts("       @y = (" <> Enum.join(y, ", ") <> ")")
+    case PWC.magicNumber(x, y) do
+      {:ok, magic} ->
+        IO.puts("Output: #{to_string(magic)}")
+        IO.puts("\nThe magic number is #{to_string(magic)}.")
+        IO.puts("@x = (" <> Enum.join(x, ", ") <> ")")
+        IO.puts("   +  " <> Enum.join(
+          Enum.map(x, fn _ -> magic end), "  "
+        ))
+        IO.puts("@y = (" <> Enum.join(
+          Enum.map(x, fn n -> n + magic end), ", "
+        ) <> ")")
+      {:err, _} ->
+        IO.puts('Output: no magic number')
+    end
+  end
+end
+
+IO.puts("Example 1:")
+PWC.solution([3, 7, 5], [9, 5, 7])
+
+IO.puts("\nExample 2:")
+PWC.solution([1, 2, 1], [5, 4, 4])
+
+IO.puts("\nExample 3:")
+PWC.solution([2], [5])
+
+IO.puts("\nExample 4:")
+PWC.solution([1, 2], [4, 2])
diff --git a/challenge-268/packy-anderson/elixir/ch-2.exs b/challenge-268/packy-anderson/elixir/ch-2.exs
new file mode 100755
index 0000000000..e0f0fae4d0
--- /dev/null
+++ b/challenge-268/packy-anderson/elixir/ch-2.exs
@@ -0,0 +1,40 @@
+#!/usr/bin/env elixir
+
+defmodule PWC do
+  # list is empty, return results
+  defp numberGame([], results) do
+    results
+  end
+
+  # grab the first elem off list, recurse
+  defp numberGame([x | rest], results) do
+    numberGame(x, rest, results)
+  end
+
+  # grab second elem off list, swap them, recurse
+  defp numberGame(x, [y | rest], results) do
+    results = Enum.concat(results, [y, x])
+    numberGame(rest, results)
+  end
+
+  # sort the list and then recursively swap element pairs
+  def numberGame(ints) do
+    sortedInts = Enum.sort(ints)
+    numberGame(sortedInts, [])
+  end
+
+  def solution(ints) do
+    IO.puts("Input: @ints = (" <> Enum.join(ints, ", ") <> ")")
+    result = PWC.numberGame(ints)
+    IO.puts("Output: (" <> Enum.join(result, ", ") <> ")")
+  end
+end
+
+IO.puts("Example 1:")
+PWC.solution([2, 5, 3, 4])
+
+IO.puts("\nExample 2:")
+PWC.solution([9, 4, 1, 3, 6, 4, 6, 1])
+
+IO.puts("\nExample 3:")
+PWC.solution([1, 2, 2, 3])