Fix error in rmq values

chapter09.tex

@@ -434,7 +434,7 @@ the union of the ranges $[1,4]$ and $[3,6]$:
 \node at (7.5,1.4) {$7$};
 \end{tikzpicture}
 \end{center}
-Since $\textrm{rmq}(1,4)=2$ and $\textrm{rmq}(3,6)=0$,
+Since $\textrm{rmq}(1,4)=3$ and $\textrm{rmq}(3,6)=1$,
 we can conclude that $\textrm{rmq}(1,6)=1$.
 
 \section{Binary indexed trees}