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                #### O(n) ``` for(int i = 0; i < len;i++){ x = x +1; } ``` 其中第一條語句的循環變量i要增加到n,故它執行n次。第二條語句作為循環體語句也要執行n次。所以,該程序段所有語句執行的次數為:T(n)=2n。故其時間復雜度為:T(n)=O(n)。實際上,在分析時間復雜度時,只需要關注隨著問題規模n增大,語句執行次數變化最快的語句即可分析出,如本例中的x=x+1就是這樣的語句
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