draw(z80--z86);
draw(z90--z96);
draw(z100--z106);
-draw(z110--z116);
drawarrow(z15--z65);
drawarrow(z24--z74);
drawarrow(z33--z83);
label.top(btex $x_1$ etex,z26);
label.top(btex $x_2$ etex,z36);
label.top(btex \dots etex,z66);
-label.top(btex $x_{n-2}$ etex,z106);
-label.top(btex $x_{n-1}$ etex,z116);
+label.top(btex $x_{n-2}$ etex,z96);
+label.top(btex $x_{n-1}$ etex,z106);
endfig;
z614=(14v,2v);
z615=(15v,2v);
+% ve skutecnosti dle znaceni
+% by melo byt z6* ale uz
+% obsazeno
+z815=(1.5v,2v);
+z855=(5.5v,2v);
+z895=(9.5v,2v);
+z813=(13.5v,2v);
+
+z715=(1.5v,1v);
+z755=(5.5v,1v);
+z795=(9.5v,1v);
+z713=(13.5v,1v);
+
+z9=(4v,0v);
pickup pencircle scaled 0.4pt;
draw(z10--z115--z215--z20--cycle);
drawarrow(z413--z513);
drawarrow(z235--z335);
drawarrow(z211--z311);
+drawarrow(z815--z715);
+drawarrow(z855--z755);
+drawarrow(z895--z795);
+drawarrow(z813--z713);
label.llft(btex $n$ etex,z075);
label.bot(btex $S_n$ etex,z175);
label.bot(btex $S_{n\over 4}$ etex,z555);
label.bot(btex $S_{n\over 4}$ etex,z595);
label.bot(btex $S_{n\over 4}$ etex,z513);
+label.rt(btex Bitonick\'a t\v r\'\i di\v cka $B_{n}$ etex,z9);
endfig;