Update exam/packet.tex

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\problem{Problem 3: Merge Intervals}
\textit{Difficulty: Hard}
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:
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:
1. The sequence starts out empty.
2. 6 - add a 6 to the end of the sequences
3. 7 - if the sequence is non-empty and its last chracter is \‘6\’, remove that last \‘6\’, otherwise, add \‘7\’ to the end of the sequence
3. 7 - if the sequence is non-empty and its last chracter is ‘6’, remove that last ‘6’, otherwise, add ‘7’ to the end of the sequence
4. A - reverse the sequence
5. B - add a duplicate of the current sequence to the end of it
6. # - clear the sequence