TWC198

2 files changed, 47 insertions, 0 deletions

diff --git a/challenge-198/deadmarshal/lua/ch-1.lua b/challenge-198/deadmarshal/lua/ch-1.lua
new file mode 100644
index 0000000000..84837b4562
--- /dev/null
+++ b/challenge-198/deadmarshal/lua/ch-1.lua
@@ -0,0 +1,19 @@
+#!/usr/bin/env lua
+
+local function max_gap(t)
+  local temp,count,max = 0,0,0
+  if #t < 2 then return 0 end
+  table.sort(t)
+  for i=1,#t,2 do
+    temp = math.abs(t[i] - t[i+1])
+    if temp > max then max = temp end
+  end
+  for i=1, #t-1 do
+    if math.abs(t[i] - t[i+1]) == max then count = count + 1 end
+  end
+  return count
+end
+
+print(max_gap({2,5,8,1}))
+print(max_gap({3}))
+
diff --git a/challenge-198/deadmarshal/lua/ch-2.lua b/challenge-198/deadmarshal/lua/ch-2.lua
new file mode 100644
index 0000000000..87f3653435
--- /dev/null
+++ b/challenge-198/deadmarshal/lua/ch-2.lua
@@ -0,0 +1,28 @@
+#!/usr/bin/env lua
+
+local function is_prime(n)
+  assert(type(n) == 'number', 'n must be a number!')
+  local i = 5
+  if n == 2 or n == 3 then return true end
+  if n <= 1 or n % 2 == 0 or n % 3 == 0 then return false end
+  while i * i <= n do
+    if n % i == 0 or n % (i+2) == 0 then return false end
+    i = i + 6
+  end
+  return true
+end
+
+local function prime_count(n)
+  assert(type(n) == 'number', 'n must be a number!')
+  local count = 0
+  for i=1,n-1 do
+    if is_prime(i) then count = count + 1 end
+  end
+  return count
+end
+
+print(prime_count(10))
+print(prime_count(15))
+print(prime_count(1))
+print(prime_count(25))
+