Commit 21c6668

@@ -0,0 +1,16 @@
+This problem was recently asked by Microsoft:
+
+> Given a string, find the length of the longest substring without repeating characters.
+
+Here is an example solution in Python language.
+
+```python
+class Solution:
+  def lengthOfLongestSubstring(self, s):
+    # Fill this in.
+
+print Solution().lengthOfLongestSubstring('abrkaabcdefghijjxxx')
+# 10
+```
+
+Can you find a solution in linear time?