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CF842A Kirill And The Game

发布时间 2023-09-22 17:24:56作者: 御坂夏铃

如果考虑 \([x,y]\) 中什么位置能乘到 \([l,r]\) 就比较麻烦,简单的做法是考虑 \(l\) 和 \(r\) 对应到 \([x,y]\) 中的位置。左边界至少是 \(\frac{l-1}{k}+1\),右边界至多是 \(\frac{r}{k}\),判断一下与 \([x,y]\) 是否有交并且左边界是否小于等于右边界即可。

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