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                            ### 遞歸序
![](https://img.kancloud.cn/eb/d6/ebd6a30c9502f2c242488db7c208e7b0_896x722.png)
~~~
// 遞歸序，每個節點到3次
public static void recursion(TreeNode node){
    if(node == null){
        return ;
    }
    System.out.print(node.val+"->");
    recursion(node.left);
    System.out.print(node.val+"->");
    recursion(node.right);
    System.out.print(node.val+"->");
}
~~~
```
遞歸序:
1->2->4->4->4->2->5->5->5->2->1->3->6->6->6->3->7->7->7->3->1->
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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