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蛋疼方法过掉了……两两作差,显然有: A(k+1)*(n^(k+1)-(n-1)^(k+1))+A(k)*(n^k-(n-1)^k)+...+A(1)*(n-(n-1))+A(0)*0=n^k 然后把括号内展开可以依次推出A(k+1),A(k),... 用这个方法蛋疼了一个小时终于AC了。 Followed by:
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