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                            ## 布隆過濾器基本原理
1. 1970年伯頓.布隆提出;
2. 用很小的空間在一個大數據集中過濾一些小數據,判斷它是否存在;
3. 可以保證誤差率;
4. 實現原理:一個很長的二進制向量和若干個哈希函數;
5. 需要參數(3個):m個二進制向量(0 1數組),n個預備數據,k個hash函數;
6. 構建布隆過濾器:n個預備數據走一遍上面過程;
7. 判斷元素存在:走一遍上面過程:如果都是1,則表明存在,反之不存在.
![](https://img.kancloud.cn/66/32/663267a9dc6d6607628624e4d98410c6_1047x506.png)
B站科普:https://www.bilibili.com/video/BV1v5411b7P7?from=search&seid=17898861140863969994
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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