Update exam/packet.tex
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\end{verbatim}
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% ========================= Problem 4 =========================
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\problem{Problem 3: Merge Intervals}
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\textit{Difficulty: Hard}
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\problem{Problem 4: Six Seven}
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\textit{Difficulty: Easy}
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\begin{itemize}
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You are given a string S composed of only the characters ‘6', ‘7’, ‘A', ‘B', and ‘\#' (without the quotation marks). This string is processed from left to right, and you must maintain a sequence of chracters that changes according to these rules:
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