We examined in a previous exercise a program that extracts a chronological listing of the exercises on the Programming Praxis website from the praxis.info file. We also discussed in a previous exercise a program that creates a permuted index. In today’s exercise we will combine those two programs into the program that is used to create the Permuted Table of Contents page at Programming Praxis.

The format of the praxis.info file was given in a previous exercise. The output from today’s program should look like this:

<table cellpadding="10">
<tr><td>129</td><td>20 Apr 2010</td><td align="right">&nbsp;</td><td>145 Puzzle: Build and evaluate expressions using the digits one through nine and the simple arithmetic operators</td><td><a href="/2010/04/20/145-puzzle/">exercise</a> <a href="/2010/04/20/145-puzzle/2/">solution</a> <a href="http://programmingpraxis.codepad.org/SzbrJbjx">codepad</a></td></tr>
<tr><td>51</td><td>17 Jul 2009</td><td align="right">International Mathematical Olympiad: Three exercises from</td><td>1960s math competitions</td><td><a href="/2009/07/17/international-mathematical-olympiad/">exercise</a> <a href="/2009/07/17/international-mathematical-olympiad/2/">solution</a> <a href="http://programmingpraxis.codepad.org/JRGmt2wZ">codepad</a></td></tr>

Your task is to write a program that reads praxis.info and produces the permuted table of contents. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.


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