在下面循环语句中内层循环体S语句的执行总次数为（）。 for(int i=0; i i++) for(int j=i; j j++) S;

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【单选题】【消耗次数：1】

① n2

② (n+1)/2

③ n(n-1)/2

④ n(n+1)/2

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