Update section a materials for cse 250

src/teaching/cse-250/2022fa/index.erb

@@ -406,11 +406,15 @@ schedule:
     - date: 11/02/22
       topic: Balanced Trees (AVL, Red-Black)
       dow: Wed
+      section_a:
+        slides: slide/26b-AVLTreesContdAndRBTrees.pdf
       section_b:
         slides: slide/26b-AVLTreesContdAndRBTrees.pdf
     - date: 11/04/22
       topic: Balanced Trees (Red-Black)
       dow: Fri
+      section_a:
+        slides: slide/27b-RBTrees.pdf
       section_b:
         slides: slide/27b-RBTrees.pdf
   - week: 11
@@ -443,11 +447,15 @@ schedule:
       due: PA3-Tests
       dow: Mon
       topic: The Memory Hierarchy
+      section_a:
+        slides: slide/31b-MemoryHierarchy.pdf
       section_b:
         slides: slide/31b-MemoryHierarchy.pdf
     - date: 11/16/22
       dow: Wed
       topic: Secondary Storage (Static Tree Indexes)
+      section_a:
+        slides: slide/lec33a.pdf
       section_b:
         slides: slide/32b-ISAMIndex.pdf
     - date: 11/18/22