Advent of Code solutions
All solutions expect input on stdin and produce the answer on stdout
The following is an example of running a java solution:
javac Fuel.java
java Fuel < input.txt > ans.txt
In the above, input.txt is the path to the input file, and ans.txt is the path to the file where
you would like the answer to be written. You can leave out > ans.txt if you would prefer the answer
be shown in the terminal.