Merge remote-tracking branch 'upstream/master'

1 files changed, 19 insertions, 0 deletions

diff --git a/challenge-241/deadmarshal/lua/ch-1.lua b/challenge-241/deadmarshal/lua/ch-1.lua
new file mode 100644
index 0000000000..a63054cda6
--- /dev/null
+++ b/challenge-241/deadmarshal/lua/ch-1.lua
@@ -0,0 +1,19 @@
+#!/usr/bin/env lua
+
+local function arithmetic_triplets(t,diff)
+  local count = 0
+  for i=1,#t do
+    for j=i+1,#t do
+      for k=j+1,#t do
+	if t[j] - t[i] == diff and t[k] - t[j] == diff then
+	  count = count + 1
+	end
+      end
+    end
+  end
+  return count
+end
+
+print(arithmetic_triplets({0,1,4,6,7,10},3))
+print(arithmetic_triplets({4,5,6,7,8,9},2))
+