1.1 Question lists
 1.2 Basic Knowledge
 1.3 Array
  1.3.1 Application
 1.4 Linked list
  1.4.1 Basic
  1.4.2 Operations
  1.4.3 Application
 1.5 Matrix
 1.6 Stack
  1.6.1 Application of Stack
 1.7 Queue
  1.7.1 Circule Queue
  1.7.2 Application of queue
 1.8 Heap
 1.9 Tree
  1.9.1 Search Tree
  1.9.2 Tree and recursion
  1.9.3 Application
 1.10 Graph
  1.10.1 Basic
  1.10.2 DFS and BFS
  1.10.3 spanning tree
  1.10.4 Application