Help in Goodbye 2019 problem F (Awesome substrings)

Правка en3, от bully....maguire, 2019-12-31 16:00:54

I read the Editorial of this problem . I got some idea but did not understood it completely .Can someone help me explaining it (will be good if explained using example) .

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en3 Английский bully....maguire 2019-12-31 16:00:54 28 Tiny change: 'orces.com/contest/1270/problem/F) of this ' -> 'orces.com/blog/entry/72611) of this '
en2 Английский bully....maguire 2019-12-31 11:42:51 100
en1 Английский bully....maguire 2019-12-31 11:41:48 224 Initial revision (published)