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                            [TOC]

# 時間復雜度

`Big O notation`

* `O(1):`常數復雜度,無論多少次都不變
* `O(log n):`對數復雜度  `for (int i = 0; i < n; i = i * 2)`也就是log(2n)
* `O(n^2):`平方n*n,雙層for循環
* `O(n^3):` 立方,三層for循環
* `O(2^n):` 指數, 常熟 K乘以(n個k)
* `O(n!):` 階層, `n!=1*2*3*4*5······*n`

注意:只看最高復雜度的運算

![](https://img.kancloud.cn/f8/dc/f8dc7f2acad4edcc2ed2b34d287e43bf_1103x731.png)

![](https://img.kancloud.cn/3c/b3/3cb3692327915f2b0482873d93c2158b_1916x1016.png)

# 跳表空間復雜度

![](https://img.kancloud.cn/dc/c7/dcc7ebdc076dd083d9aeedb578af61b0_1270x541.png)













































                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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