gen.java : Your test case generator should be wrriten here.

stupid.java : This brute force solution of problem but its correct.

Main.java : Your actual solution which you want to test.

s.sh : This script will run gen.java which will produce input and then this input will given to stupid.java and Main.java and difference between outputs generated by these programs are compared using diff command.

gen.java contains some cool methods for generating trees like line graph or binary tree or some small trees

I will try to update more generators for graphs or special numbers as I will get time.