Shortest subsequence

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    Given two strings S1 and S2, find the shortest subsequence in S1 that contains all the characters in S2.
    Note: the order in which S2's characters appear in S1 does not matter

    S2 = "BEK"

    shortest subsequence is "EKCLB"

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    • For each char in s2, use an array to store positions of that character in s1
    • The problem becomes: given a list of sorted arrays, find the minimum range contains at least one number from each array.

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