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Which of the following is the longest common subsequence between the strings “hbcfgmnapq” and “cbhgrsfnmq” ?

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Which of the following is the longest common subsequence between the strings “hbcfgmnapq” and “cbhgrsfnmq” ?

(a) hgmq

(b) cfnq

(c) bfmq

(d) fgmna

I have been asked this question during an online exam.

This interesting question is from Longest Common Subsequence in section Dynamic Programming of Data Structures & Algorithms II

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Right option is (d) fgmna

Easy explanation - The length of the longest common subsequence is 4. But ‘fgmna’ is not the longest common subsequence as its length is 5.

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