Commit 1b999e4

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+def assert_equal(x, y)
+  raise [x, y].inspect unless x == y
+end
+
+class Solution
+  def self.run(string)
+    max = 0
+    current = 0
+
+    0.upto(string.chars.size) do |i|
+      if string[i] == string[i-1]
+        max = max > current ? max : current
+        current = 0
+      end
+      current = current + 1
+    end
+
+    max
+  end
+end
+
+assert_equal Solution.run('abrkaabcdefghijjxxx'), 10
+
+# step 1. understand the problem
+# step 2. pick a solution
+# step 3. write the solution