tree

\documentclass{article}
\usepackage[english, russian]{babel}
\usepackage{tikz}
\usepackage{tikz-qtree}
\usetikzlibrary{shadows, trees, arrows, automata, positioning}

\begin{document}
%\tikzset{level distance = 60 pt, sibling distance = 19 pt}
\begin{tikzpicture}[
scale = 1, %1 = 100 % 2 = 200 проц
font = \Large,
edge from parent fork down,
sibling distance = 1cm, %дистанция между потомками одного узла
%grow = left, %up down left rigth
level distance = 1 cm,
frontier/.style = {distance from root = 150 pt}
]
\Tree
[
.ABC %создали узел, подразумевается, что будут потомки
    [.A
        [.C K ]
            [.\node(d){D}; L ]
    ] %не будет потомков
    [.B
        [.\node[draw]{E}; \node[draw, circle, magenta]{M}; ]
        [.F
            [.G \node[draw, circle, green](n){N}; ]
            [.\node[draw]{H};
                [.I \node[draw](o){O}; ]
                [.J P ]
            ]
        ]
    ]
]
\draw[dotted, ->] (o) to (d);
\draw[red, dashed, ->] (d)[bend right = 80] to (n);
\draw[blue, <<->>] (d)..controls + (south:3) and + (south west:5)..(o);
\end{tikzpicture}

\newpage
%\tikzset{level distance = 60 pt, sibling distance = 19 pt}
\begin{tikzpicture}[
scale = 1, %1 = 100 % 2 = 200 проц
font = \Large,
%edge from parent fork down,
sibling distance = 1cm, %дистанция между потомками одного узла
grow' = right, %up down left rigth
level distance = 3 cm,
frontier/.style = {distance from root = 150 pt}
]
\Tree
[.A
    [.\node[draw, red]{B};
        [.\node(f){F}; ]
    ]
    [.C
        [.\node[draw, circle, blue](g){G}; ]
    ]
    [.D
        [.\node(h){H}; ]
        [.I
            [.\node(k){K}; ]
        ]
    ]
    [.\node[draw]{E};
        [.\node(j){J}; ]
    ]
]
\draw[red, ->] (k) to (h);
\draw[blue, <<->>, dotted] (j) to (k);
\draw[yellow, ->] (g) to (k);
\draw[green, dashed, ->] (f) to (k);
\end{tikzpicture}

\newpage\tikzstyle{dot}= [circle, fill = black, inner sep = 1.5 pt]
\begin{tikzpicture}[
font = \Large,
->,
>=stealth',
node distance = 2.8cm,
loop above/.style={min distance = 6 cm, in = 60, out = 120}
]
\node[dot, label = below:$v_1$](0){};
\node[dot, label = $v_2$](1)[above right of = 0]{};
\node[dot, label = below:$v_3$](f)[below right of = 1]{};

\path
    (0) edge [bend right = 20] (1)
    (1) edge [bend right = 20] (0)
    (f) edge (0)
    edge [loop above] (f);
\end{tikzpicture}
\end{document}