+<p>If you're profiling, compile and run with</p>
+<pre><code>ghc -O2 --make advent01.hs -prof -auto-all -caf-all -fforce-recomp -rstopts
+time ./advent01 +RTS -p -hy</code></pre>
+<p>and create the profile picture with <code>h2ps advent01.hp</code> .</p>