1 files changed, 59 insertions, 0 deletions
diff --git a/challenge-200/roger-bell-west/lua/ch-1.lua b/challenge-200/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..7c74097805
--- /dev/null
+++ b/challenge-200/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,59 @@
+#! /usr/bin/lua
+
+-- by Michael Anderson at
+-- https://stackoverflow.com/questions/8722620/comparing-two-index-tables-by-index-value-in-lua
+function recursive_compare(t1,t2)
+   if t1==t2 then return true end
+   if (type(t1)~="table") then return false end
+   local mt1 = getmetatable(t1)
+   local mt2 = getmetatable(t2)
+   if( not recursive_compare(mt1,mt2) ) then return false end
+   for k1,v1 in pairs(t1) do
+      local v2 = t2[k1]
+      if( not recursive_compare(v1,v2) ) then return false end
+   end
+   for k2,v2 in pairs(t2) do
+      local v1 = t1[k2]
+      if( not recursive_compare(v1,v2) ) then return false end
+   end
+   return true
+end
+
+function arithmeticslices(l)
+   local o = {}
+   if #l >= 3 then
+      for a = 1, #l - 2 do
+         local valid = false
+         for b = a + 2, #l do
+            local v = {table.unpack(l, a, b)}
+            if not valid then
+               for i = 1, #v - 2 do
+                  if v[i + 1] - v[i] == v[i + 2] - v[i + 1] then
+                     valid = true
+                     break
+                  end
+               end
+            end
+            if valid then
+               table.insert(o, v)
+            end
+         end
+      end
+   end
+   return o
+end
+
+if recursive_compare(arithmeticslices({1, 2, 3, 4}), {{1, 2, 3}, {1, 2, 3, 4}, {2, 3, 4}}) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if recursive_compare(arithmeticslices({2}), {}) then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+