RogerBW solutions for challenge no. 306

2 files changed, 77 insertions, 0 deletions

diff --git a/challenge-306/roger-bell-west/lua/ch-1.lua b/challenge-306/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..1ab8b6d95c
--- /dev/null
+++ b/challenge-306/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,43 @@
+#! /usr/bin/lua
+
+function windowed(a, n)
+   local out = {}
+   for i = 1, #a - n + 1 do
+      local t = {}
+      for j = i, i + n - 1 do
+         table.insert(t, a[j])
+      end
+      table.insert(out, t)
+   end
+   return out
+end
+
+function oddsum(a)
+   local out = 0
+   local l = 1
+   while l <= #a do
+      for _i, s in ipairs(windowed(a, l)) do
+         for _j, nn in ipairs(s) do
+            out = out + nn
+         end
+      end
+      l = l + 2
+   end
+   return out
+end
+   
+
+if oddsum({2, 5, 3, 6, 4}) == 77 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if oddsum({1, 3}) == 4 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-306/roger-bell-west/lua/ch-2.lua b/challenge-306/roger-bell-west/lua/ch-2.lua
new file mode 100755
index 0000000000..1d3179e5cb
--- /dev/null
+++ b/challenge-306/roger-bell-west/lua/ch-2.lua
@@ -0,0 +1,34 @@
+#! /usr/bin/lua
+
+function lastelement(a)
+   local b = a
+   while true do
+      table.sort(b)
+      local f = table.remove(b, #b)
+      local s = table.remove(b, #b)
+      if f > s then
+         table.insert(b, f - s)
+      end
+      if #b == 0 then
+         return 0
+      end
+      if #b == 1 then
+         return b[1]
+      end
+   end
+end
+
+if lastelement({3, 8, 5, 2, 9, 2}) == 1 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if lastelement({3, 2, 5}) == 0 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+