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                            ### 常見時間復雜度

|  執行次數函數舉例  |  階  |  非正式術語  |
| --- | --- | --- |
|  12  |  O(1)  |  常數階  |
|  2n+3  |  O(n)  |  線性階  |
| 3n2+2n+1 |  O(n2)  | 平方階|
|  5log?n+20  |  O(logn)  |  對數階  |
|  2n+3nlog?n+19  |  O(nlogn)  |  nlogn階  |
|  6n3+2n2+3n+4  |  O(n3)  |  立方階  |
|   2? | O(2?)  |  指數階  |
>[warning]注意，經常將log?n（以2為底的對數）簡寫成logn

### 常見時間復雜度之間的關系
![](https://box.kancloud.cn/1e66bf2f8909ec8db5fef53d6d9db26e_547x401.bmp)
所消耗的時間從小到大:
O(1) < O(logn) < O(n) < O(nlogn) < O(n2) < O(n3) < O(2?) < O(n!) < O(n?)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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