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这是一个例子：
T(1) = 1 f(n) = log2n T(n) = a * T(n-1) + f(n)
我还没有和他们一起解决 f(n) 的问题。它们究竟是如何解决的？你只是用 log2n 切换 f(n) 还是解决方案是别的？