1 files changed, 102 insertions, 0 deletions
diff --git a/challenge-260/roger-bell-west/lua/ch-2.lua b/challenge-260/roger-bell-west/lua/ch-2.lua
new file mode 100755
index 0000000000..d9407cf3ad
--- /dev/null
+++ b/challenge-260/roger-bell-west/lua/ch-2.lua
@@ -0,0 +1,102 @@
+#! /usr/bin/lua
+
+function deepcopy(src)
+   local dst = {}
+   for k, v in pairs(src) do
+      if type(v) == "table" then
+         v = deepcopy(v)
+      end
+      dst[k] = v
+   end
+   return dst
+end
+
+function permute(a)
+   local out = {}
+   local n = #a
+   local c = {}
+   for i = 1,n do
+      table.insert(c, 1)
+   end
+   table.insert(out, deepcopy(a))
+   local i=1
+   while true do
+      if i > n then
+         break
+      end
+      if c[i] < i then
+         if i % 2 == 1 then
+            a[1],a[i] = a[i],a[1]
+         else
+            a[c[i]],a[i] = a[i],a[c[i]]
+         end
+         table.insert(out, deepcopy(a))
+         c[i] = c[i]+1
+         i = 1
+      else
+        c[i] = 1
+         i = i+1
+      end
+   end
+   return out
+end
+
+function split(t)
+   local cl = {}
+   string.gsub(t,
+               "(.)",
+               function(c)
+                  table.insert(cl, c)
+               end
+   )
+   return cl
+end
+
+function join(t)
+   local out=""
+   for k,v in pairs(t) do
+      out = out .. v
+   end
+   return out
+end
+
+function dictionaryrank(a)
+   local c = split(a)
+   local d = {}
+   for _, o in ipairs(permute(c)) do
+      d[join(o)] = true
+   end
+   local dd = {}
+   for k, _ in pairs(d) do
+      table.insert(dd, k)
+   end
+   table.sort(dd)
+   for i, s in ipairs(dd) do
+      if s == a then
+         return i
+      end
+   end
+   return 0
+end
+
+if dictionaryrank("CAT") == 3 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if dictionaryrank("GOOGLE") == 88 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if dictionaryrank("SECRET") == 255 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+