final_result.tex

\begin{tikzpicture}[
    grow=right, 
    level 1/.style={sibling distance=3.5cm,level distance=5.2cm},
    level 2/.style={sibling distance=3.5cm, level distance=6.7cm},
    edge from parent/.style={very thick,draw=blue!40!black!60,
        shorten >=5pt, shorten <=5pt},
    edge from parent path={(\tikzparentnode.east) -- (\tikzchildnode.west)},
    kant/.style={text width=2cm, text centered, sloped},
    every node/.style={text ragged, inner sep=2mm},
    cir/.style={circle, shade, top color=white,
    bottom color=blue!50!black!20, draw=blue!40!black!60, very
    thick },
    cirr/.style={circle, shade, top color=white,
    bottom color=red!50!black!20, draw=red!40!black!60, very
    thick },
    dr/.style={diamond, drawshade,  top color=white,
    bottom color=red!50!black!20, draw=red!40!black!60, very
    thick},
    bd/.style={draw=blue!50!white, line width=1pt, dash pattern=on 1pt off 4pt on 6pt off 4pt,
                                rectangle, rounded corners},
pil/.style={
	->,
	thick,
	shorten <=2pt,
	shorten >=2pt,},


    d/.style={diamond, drawshade,  top color=white,
    bottom color=blue!50!black!20, draw=blue!40!black!60, very
    thick},
    bwt/.style = {rectangle, draw,  text width=5em, text centered, minimum height=2em, draw=white, fill=white}]


\node[cirr] (1) {7};

\node[cirr, below of=1, node distance=3cm] (3) {2};

\node[cirr, below of=3, node distance=3cm] (4) {2};

\node[d, below of=4, node distance=3cm] (if) {};

\node[cirr, below of=if, left of=if, node distance=3cm] (10) {10};

\node[cirr, below of=if, right of=if, node distance=3cm] (9) {18};



\draw[->] (1) -- (3);
\draw[->] (3) -- (4);
\draw[->] (4) -- (if);
\draw[->] (if) -- (9);
\draw[->] (if) -- (10);


\end{tikzpicture}