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                            ## 鏈表
鏈表有`單鏈表`、`雙鏈表`和`環形鏈表`等。
* 單鏈表
![](https://img.kancloud.cn/aa/99/aa99e101d23cbdbbbfe61810de9f27e3_1462x268.png)

* 雙鏈表
![](https://img.kancloud.cn/e8/af/e8af1f1c7010fd0132572abeb4de6c44_1458x260.png)

* 環形鏈表
![](https://img.kancloud.cn/cf/77/cf77ce955f738db74ca5283e546aaf33_754x686.png)

### 優點  
1. 靈活分配內存空間。
2. 能在O(1)刪除或添加元素。
### 缺點
1. 查詢元素需要O(n)時間。

### 技巧
* 快慢指針（slow走一步，fast走2步）
* 虛假鏈表頭

  

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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