[Data Structure] tutor

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• Data Structure
  
  
  
  
  • Basic tree
    
    
    
    
    • Definition of Tree
    
    
    • Binary Tree
    
    
    • Expression of Binary Tree
    
    
    • Tree traversal
      
      
      
      
      • Preorder Traversal
        
        
        
        

        • 
          1. Visit the root.
          

          
          2. Traverse the left subtree.
          

          
          3. Traverse the right subtree.
          

      
      
      • Inorder Traversal
        
        
        
        

        • 
          1. Traverse the left subtree.    
          2. Visit the root.    
          3. Traverse the right subtree. 
          

      
      
      • Postorder Traversal
        
        
        
        
        • 1. Traverse the left subtree.
          2. Traverse the right subtree.
          3. Visit the root.