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    <p>You'll probably have to strip protocol and query string parameters, so +1 to the advise to use <code>System.URI</code> class to handle that.</p> <p>As for the printing it in tree-shape - a direct approach is to use a <code>Dictionary&lt;string, string&gt;</code> to keep association of child (key) to a parent (value).</p> <p>Another way is to take advantage of <code>List&lt;T&gt;.Sort</code>, e.g. like this:</p> <pre><code>public static void Print(List&lt;string&gt; list) { var path = new Stack&lt;string&gt;(); var count = new Stack&lt;int&gt;(); path.Push(""); count.Push(0); list.Sort(new Comparison&lt;string&gt;(UrlComparison)); foreach (var x in list) { while (!x.StartsWith(path.Peek())) { path.Pop(); count.Pop(); } count.Push(count.Pop() + 1); foreach(var n in count.Reverse()) Console.Write("{0}.", n); Console.WriteLine(" {0}", x); path.Push(x); count.Push(0); } } </code></pre> <p>Unfortunately, <code>p.campbell</code> is right, a custom comparison is actually required here, which makes this implementation still pretty performant, but more bulky (<code>?:-abuse</code> warning):</p> <pre><code>public static int UrlComparison(string x, string y) { if (x == null &amp;&amp; y == null) return 0; if (x == null) return -1; if (y == null) return 1; for(int n = 0; n &lt; Math.Min(x.Length, y.Length); n++) { char cx = x[n], cy = y[n]; if(cx == cy) continue; return (cx == '/' || cx == '.' || cx == '?') ? -1 : (cy == '/' || cy == '.' || cy == '?') ? 1 : (cx &gt; cy) ? 1 : -1; } return (x.Length == y.Length) ? 0 : (x.Length &gt; y.Length) ? 1 : -1; } </code></pre> <p>PS: Just to put a disclaimer, I feel that Stacks logic is consize, but a bit more complex to understand. In a long-term project, I'd stick with a child-parent dictionary.</p>
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    1. COExcellent start! One nit: the sorting is current such that it [sorts "Page10" to just under "Page1"](http://i.imgur.com/5Vnzf.png)
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    2. CO@p.campbell Good point! I've added a custom sort comparison.
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    3. COThanks DK. This is exactly what I needed!
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