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在一些计算问题中常常会遇到求某一个整标函数f(n)的问题,其中自变量n取整数值。例如,求数列的前n项和的问题:
In some computational problems, it is often encountered the problem of seeking a certain integer function f(n), where the independent variable n takes an integer value. For example, to solve the problem of the first n items in the series: