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我的教训：这道题有一个阴险的地方。。。有可能出现以下情况：
A
|
+ - ...
或
?
|
... - +
也就是有可能出现输入和输出的字母或“？”和与它的连线不是水平关系，而是垂直关系。请WA和RE的朋友们注意。
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