Data commit

Task/Equilibrium-index/Elixir/equilibrium-index-1.elixir

@@ -0,0 +1,8 @@
+defmodule Equilibrium do
+  def index(list) do
+    last = length(list)
+    Enum.filter(0..last-1, fn i ->
+      Enum.sum(Enum.slice(list, 0, i)) == Enum.sum(Enum.slice(list, i+1..last))
+    end)
+  end
+end

Task/Equilibrium-index/Elixir/equilibrium-index-2.elixir

@@ -0,0 +1,7 @@
+defmodule Equilibrium do
+  def index(list), do: index(list,0,0,Enum.sum(list),[])
+
+  defp index([],_,_,_,acc), do: Enum.reverse(acc)
+  defp index([h|t],i,left,right,acc) when left==right-h, do: index(t,i+1,left+h,right-h,[i|acc])
+  defp index([h|t],i,left,right,acc)                   , do: index(t,i+1,left+h,right-h,acc)
+end

Task/Equilibrium-index/Elixir/equilibrium-index-3.elixir

@@ -0,0 +1,9 @@
+indices = [
+  [-7, 1, 5, 2,-4, 3, 0],
+  [2, 4, 6],
+  [2, 9, 2],
+  [1,-1, 1,-1, 1,-1, 1]
+]
+Enum.each(indices, fn list ->
+  IO.puts "#{inspect list} => #{inspect Equilibrium.index(list)}"
+end)