Merge pull request #331 from sarthak-v/patch-6

missing video issue #329

ruby_programming/computer_science/lesson_common_data_structures_algorithms.md

@@ -32,7 +32,7 @@ Look through these now and then use them to test yourself after doing the assign
 <div class="lesson-content__panel" markdown="1">
   1. Glance over the [Wikipedia entry on Data Structures](http://en.wikipedia.org/wiki/Data_structure) for a high level overview of things.
   2. Learn about Queues and Stacks by watching [this video](https://www.youtube.com/watch?v=6QS_Cup1YoI)
-  3. Learn about binary search trees by watching [this video](http://cs50.tv/2012/fall/shorts/binary_search/binary_search-720p.mp4) from Harvard's CS50x on edX.
+  3. Learn about binary search trees by watching [this video](https://www.youtube.com/watch?v=T98PIp4omUA) from Harvard's CS50 on Youtube.
   4. Learn about basic algorithms from Coursera's Algorithms course in [this video](http://www.youtube.com/watch?v=u2TwK3fED8A).  The first 10 minutes are really the meat of the introduction to algorithms, the rest gets more mathematical (if you're so inclined).
   5. Read the [Gentle Introduction to Algorithms for Web Developers](http://www.giocc.com/a-gentle-introduction-to-algorithms-for-web-developers.html) for another basic look at what algorithms are.
   5. Finally, learn about Depth First Search and Breadth First Search from this series of videos on YouTube: