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                            ### hash沖突解決方案
* 開放定址法（線性探測再散列，二次探測再散列，偽隨機探測再散列）
* rehash法
* 鏈地址法(拉鏈)
* 建立公共溢出區

### Time33算法
目前比較好的字符串Hash算法有Time33算法，即對字符串逐字符迭代乘以33，求得hash值，算法原型：
hash(i) = hash(i-1) * 33 + str[i]
![](https://img.kancloud.cn/f4/0e/f40e4a3718bdeb65e9e9a56477bac28c_813x72.png)

算法優化：先對字符串取信息指紋，再對信息指紋求Hashcode，因為字符串微小的變化就可以引起信息指紋的巨大不同，因此可以獲得較好的隨機散列
![](https://img.kancloud.cn/ca/5f/ca5fc63c86aafc2b59ba80a556c9db5d_668x97.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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