Need help to solve this problem from CSES problemset.

Правка en1, от padfoot1717, 2020-09-01 11:43:00

I am stucked at the problem Shortest subsequence. Can someone kindly explain an optimal algorithm to solve this problem?

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en1 Английский padfoot1717 2020-09-01 11:43:00 214 Initial revision (published)