一个小疑问

P1317 低洼地

![](file:///C:/Users/Administrator/Desktop/%E6%97%A0%E6%A0%87%E9%A2%98.png)
by hanker_AFO @ 2018-02-21 22:15:43

![](https://cdn.luogu.com.cn/upload/pic/14679.png)
by hanker_AFO @ 2018-02-21 22:16:14

虽然我就看了一眼题目，但是我觉得可以积水
by lukelin @ 2018-02-21 22:48:32

好像不会 ~~然而本题目似乎没有此类数据~~
by PC_DOS @ 2018-02-21 23:16:34

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