TIL that Travis supports Ubuntu 14.04! https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments (sometimes 12.04 is hassle with new/trendy tools)
miniblog.
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TIL Advent of Code and Project Euler will deliberately look for puzzles where the naive solution is worse than quadratic.
This ensures that people can solve them with any programming language. You don't want fast languages to be able to use the naive solution.
TIL Drupal has a credit system to give preferential treatment to people and organisations who contribute regularly!
TIL Tcl has a notion of 'safe interpreters', a mode where you can run untrusted code in a sandbox: https://www.tcl.tk/man/tcl8.4/TclCmd/safe.htm
Not many programming languages have this, but it's way safer to include in the implementation than try to build as a userland library.