_index.md: We do a little trolling

Author: mpsijm

content/_index.md

@@ -19,7 +19,9 @@ The contest will be held on the campus of the Delft University of Technology.
 
 ## Contest material
 
-To be added after the BAPC.
+- [Problem Set (pdf)](https://wisv.ch/uilbum)
+- [Solution Slides (pdf)](https://youtu.be/2yJgwwDcgV8)
+- [Packaged Problems (.zip, 69MB)](https://youtu.be/dQw4w9WgXcQ)
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 - [Photos](/photos)
 - [Final Standings](/main/scoreboard) ([Spectators](/main/scoreboard/spectators.html))