Update exam/packet.tex

exam/packet.tex

@@ -144,19 +144,18 @@ Output:
 % ========================= Problem 4 =========================
 \problem{Problem 3: Merge Intervals}
 \textit{Difficulty: Hard}
+\begin{itemize}
+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:
+\item 6 - add a 6 to the end of the sequence
-1. The sequence starts out empty.
+\item 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
-2. 6 - add a 6 to the end of the sequences
+\item A - reverse 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
+\item B - add a duplicate of the current sequence to the end of it
-4. A - reverse the sequence
+\item \# - clear the sequence
-5. B - add a duplicate of the current sequence to the end of it
+\end{itemize}
-6. # - clear the sequence
-
 \inputformat
 \begin{itemize}
-    \item The first line consists of the string S. The string consists only of the characters 6, 7, A, B, and #.
+    \item The first line consists of the string S. The string consists only of the characters 6, 7, A, B, and \#.
-    \item It is guaranteed that \texttt{s} ($1 \leq |s| \leq 10^5$)
 \end{itemize}
 
 \outputformat