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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF0>#</span><span class=cF1>define</span><span class=cF0> N </span><span class=cFE>32</span><span class=cF0>
<a name="l2"></a>
<a name="l3"></a></span><span class=cF1>class</span><span class=cF0> Node
<a name="l4"></a>{
<a name="l5"></a> Node *left, *right;
<a name="l6"></a> </span><span class=cF9>I64</span><span class=cF0> n;
<a name="l7"></a>};
<a name="l8"></a>
<a name="l9"></a></span><span class=cF9>I64</span><span class=cF0> n1, n2, common_ancestor;
<a name="l10"></a>Node *root;
<a name="l11"></a>
<a name="l12"></a>#</span><span class=cF1>define</span><span class=cF0> X_SPACING </span><span class=cFE>16</span><span class=cF0>
<a name="l13"></a>#</span><span class=cF1>define</span><span class=cF0> Y_SPACING </span><span class=cFE>45</span><span class=cF0>
<a name="l14"></a>#</span><span class=cF1>define</span><span class=cF0> ARROW_SPACING </span><span class=cFE>3</span><span class=cF0>
<a name="l15"></a>
<a name="l16"></a></span><span class=cF1>U0</span><span class=cF0> ShowTree(</span><span class=cF9>CDC</span><span class=cF0> *dc, Node *tmpn, </span><span class=cF9>I64</span><span class=cF0> *_node_x, </span><span class=cF9>I64</span><span class=cF0> *_tree_x, </span><span class=cF9>I64</span><span class=cF0> y)
<a name="l17"></a>{
<a name="l18"></a> </span><span class=cF9>I64</span><span class=cF0> node_x;
<a name="l19"></a>
<a name="l20"></a> </span><span class=cF1>if</span><span class=cF0> (tmpn)
<a name="l21"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l22"></a> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;left)
<a name="l23"></a> {
<a name="l24"></a> ShowTree(dc, tmpn-&gt;left, &amp;node_x, _tree_x, y + Y_SPACING);
<a name="l25"></a> dc-&gt;color = </span><span class=cF3>BLUE</span><span class=cF0>;
<a name="l26"></a> </span><span class=cF5>GrArrow3</span><span class=cF0>(dc, *_tree_x, y, </span><span class=cFE>0</span><span class=cF0>, node_x + ARROW_SPACING, y + Y_SPACING - ARROW_SPACING, </span><span class=cFE>0</span><span class=cF0>);
<a name="l27"></a> }
<a name="l28"></a> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;n == n1 || tmpn-&gt;n == n2)
<a name="l29"></a> {
<a name="l30"></a> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;n == common_ancestor)
<a name="l31"></a> dc-&gt;color = </span><span class=cF3>YELLOW</span><span class=cF0>;
<a name="l32"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l33"></a> dc-&gt;color = </span><span class=cF3>RED</span><span class=cF0>;
<a name="l34"></a> }
<a name="l35"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;n == common_ancestor)
<a name="l36"></a> dc-&gt;color = </span><span class=cF3>GREEN</span><span class=cF0>;
<a name="l37"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l38"></a> dc-&gt;color = </span><span class=cF3>BLUE</span><span class=cF0>;
<a name="l39"></a>
<a name="l40"></a> *_node_x = *_tree_x;
<a name="l41"></a> </span><span class=cF5>GrPrint</span><span class=cF0>(dc, *_node_x, y, </span><span class=cF6>&quot;%d&quot;</span><span class=cF0>, tmpn-&gt;n);
<a name="l42"></a> *_tree_x += X_SPACING;
<a name="l43"></a>
<a name="l44"></a> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;right)
<a name="l45"></a> {
<a name="l46"></a> ShowTree(dc, tmpn-&gt;right, &amp;node_x, _tree_x, y + Y_SPACING);
<a name="l47"></a> dc-&gt;color = </span><span class=cF3>BLUE</span><span class=cF0>;
<a name="l48"></a> </span><span class=cF5>GrArrow3</span><span class=cF0>(dc, *_node_x, y, </span><span class=cFE>0</span><span class=cF0>, node_x - ARROW_SPACING, y + Y_SPACING - ARROW_SPACING, </span><span class=cFE>0</span><span class=cF0>);
<a name="l49"></a> }
<a name="l50"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l51"></a>}
<a name="l52"></a>
<a name="l53"></a></span><span class=cF1>U0</span><span class=cF0> </span><span class=cF5>DrawIt</span><span class=cF0>(</span><span class=cF9>CTask</span><span class=cF0> *, </span><span class=cF9>CDC</span><span class=cF0> *dc)
<a name="l54"></a>{
<a name="l55"></a> </span><span class=cF9>I64</span><span class=cF0> node_x = </span><span class=cFE>0</span><span class=cF0>, tree_x = </span><span class=cFE>0</span><span class=cF0>;
<a name="l56"></a>
<a name="l57"></a> ShowTree(dc, root, &amp;node_x, &amp;tree_x, </span><span class=cFE>20</span><span class=cF0>);
<a name="l58"></a>}
<a name="l59"></a>
<a name="l60"></a></span><span class=cF1>U0</span><span class=cF0> TreeAdd(Node **_root, Node *tmpn)
<a name="l61"></a>{
<a name="l62"></a> Node *root = *_root;
<a name="l63"></a>
<a name="l64"></a> </span><span class=cF1>if</span><span class=cF0> (!root)
<a name="l65"></a> *_root = tmpn;
<a name="l66"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;n == root-&gt;n)
<a name="l67"></a> </span><span class=cF5>Free</span><span class=cF0>(tmpn);
<a name="l68"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (tmpn-&gt;n &lt; root-&gt;n)
<a name="l69"></a> TreeAdd(&amp;root-&gt;left, tmpn);
<a name="l70"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l71"></a> TreeAdd(&amp;root-&gt;right, tmpn);
<a name="l72"></a>}
<a name="l73"></a>
<a name="l74"></a></span><span class=cF1>U0</span><span class=cF0> TreeNew()
<a name="l75"></a>{
<a name="l76"></a> </span><span class=cF9>I64</span><span class=cF0> i;
<a name="l77"></a> Node *tmpn;
<a name="l78"></a>
<a name="l79"></a> </span><span class=cF1>for</span><span class=cF0> (i = </span><span class=cFE>0</span><span class=cF0>; i &lt; N; i++)
<a name="l80"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l81"></a> tmpn = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>Node</span><span class=cF7>)</span><span class=cF0>);
<a name="l82"></a> tmpn-&gt;n = </span><span class=cF5>RandU16</span><span class=cF0> % N;
<a name="l83"></a>
<a name="l84"></a> </span><span class=cF1>if</span><span class=cF0> (i == N - </span><span class=cFE>1</span><span class=cF0>)
<a name="l85"></a> n1 = tmpn-&gt;n;
<a name="l86"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (i == N - </span><span class=cFE>2</span><span class=cF0>)
<a name="l87"></a> n2 = tmpn-&gt;n;
<a name="l88"></a>
<a name="l89"></a> TreeAdd(&amp;root, tmpn);
<a name="l90"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>50</span><span class=cF0>);
<a name="l91"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l92"></a>}
<a name="l93"></a>
<a name="l94"></a></span><span class=cF1>U0</span><span class=cF0> TreeCommonAncestorFind(Node *root)
<a name="l95"></a>{
<a name="l96"></a> </span><span class=cF1>if</span><span class=cF0> (root &amp;&amp; root-&gt;n != n1 &amp;&amp; root-&gt;n != n2)
<a name="l97"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l98"></a> common_ancestor = root-&gt;n;
<a name="l99"></a> </span><span class=cF1>if</span><span class=cF0> (n1 &lt; root-&gt;n &amp;&amp; n2 &lt; root-&gt;n)
<a name="l100"></a> TreeCommonAncestorFind(root-&gt;left);
<a name="l101"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (n1 &gt; root-&gt;n &amp;&amp; n2 &gt; root-&gt;n)
<a name="l102"></a> TreeCommonAncestorFind(root-&gt;right);
<a name="l103"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l104"></a>}
<a name="l105"></a>
<a name="l106"></a></span><span class=cF1>U0</span><span class=cF0> TreeCommonAncestor()
<a name="l107"></a>{</span><span class=cF2>//Make tree and find common ancestor to n1 &amp; n2.</span><span class=cF0>
<a name="l108"></a> root = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l109"></a> n1 = n2 = common_ancestor = </span><span class=cFE>0</span><span class=cF0>;
<a name="l110"></a>
<a name="l111"></a> </span><span class=cF5>SettingsPush</span><span class=cF0>; </span><span class=cF2>//See </span><a href="https://tomawezome.github.io/ZealOS/System/TaskSettings.CC.html#l3"><span class=cF4>SettingsPush</span></a><span class=cF0>
<a name="l112"></a> </span><span class=cF5>Fs</span><span class=cF0>-&gt;draw_it = &amp;</span><span class=cF5>DrawIt</span><span class=cF0>;
<a name="l113"></a> </span><span class=cF5>DocClear</span><span class=cF0>;
<a name="l114"></a> </span><span class=cF6>&quot;Scroll with {CTRL-Left Grab}.\n&quot;</span><span class=cF0>;
<a name="l115"></a> </span><span class=cF1>try</span><span class=cF0>
<a name="l116"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l117"></a> TreeNew;
<a name="l118"></a> TreeCommonAncestorFind(root);
<a name="l119"></a> </span><span class=cF5>PressAKey</span><span class=cF0>;
<a name="l120"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l121"></a> </span><span class=cF1>catch</span><span class=cF0>
<a name="l122"></a> </span><span class=cF5>PutExcept</span><span class=cF0>;
<a name="l123"></a> </span><span class=cF5>SettingsPop</span><span class=cF0>;
<a name="l124"></a>}
<a name="l125"></a>
<a name="l126"></a>TreeCommonAncestor;
<a name="l127"></a></span><span class=cF2>/*</span><span class=cF0>
<a name="l128"></a></span><span class=cF2>Be careful with recursive routines in ZealOS</span><span class=cF0>
<a name="l129"></a></span><span class=cF2>because the stack does not grow and will overflow.</span><span class=cF0>
<a name="l130"></a>
<a name="l131"></a></span><span class=cF2>See </span><a href="https://tomawezome.github.io/ZealOS/Demo/StackGrow.CC.html#l1"><span class=cF4>::/Demo/StackGrow.CC</span></a><span class=cF2>.</span><span class=cF0>
<a name="l132"></a></span><span class=cF2>*/</span><span class=cF0>
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