Advent of Code 2020, in Clojure. Probably not with good coding style, because I am a Clojure newbie, but it works...
For details see the advent of code webpage:
Either do lein run or compile with lein uberjar and run:
$ java -jar target/uberjar/aoc2020-0.1.0-SNAPSHOT-standalone.jar
Copyright © 2020 FIXME
This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.
This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.