容易发现充要条件是存在如下三种情况之一：
.ab
ab..a
ab
b..a..
a...
...b
..b.扫一遍即可，时间复杂度 $O(nm)$。
QOJ.ac
QOJ
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Discussion #201 for Problem #8093. Jigglypuff
Type: Editorial
Status: Open
Posted by: jiangly
Posted at: 2025-12-13 00:06:24
Last updated: 2025-12-13 00:06:26
题解
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