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这个题很让人迷惑。主要有几点需要注意

Posted by 274856653 at 2021-03-04 15:25:21 on Problem 1542
这个题目很让人迷惑。。。其实是个水题。。。
首先。s, s', sv, sv'能找到多个答案。。。没有specialjudge。那么搜索顺序按照hint来。却是错的。然后正确顺序。如楼上所写。。。。水题因为顺序问题。折腾了半天。。。。寒。。。
s
s'
sv'
sv

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