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Is one string a subsequence of another

How do you check whether "ace" is a subsequence of "abcde" most efficiently?

A.Generate every subsequence of "abcde" and search themB.Check whether "abcde".includes("ace") returns trueC.Sort both strings and compare them character by characterD.Walk both strings with one pointer each, advancing on matches

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Is one string a subsequence of another

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