题目有误?Ai之和不超过109???

P1181 数列分段 Section I

@[fff团666](/space/show?uid=49562) $10^{9}$
by Juanzhang @ 2018-07-06 20:51:58


emm Orz大佬谢谢指点
by tocek_shiki @ 2018-07-06 20:53:05


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