.gitignore - add GitHub defaults for Java and Python
tree_zig_zag - update README.md, finish first draft
tree_zig_zag - initial commit of hints

Break out the hints into a separate file so that people don't risk
reading spoilers. Hints should only be referred to if you attempt
the problem for a little bit.
tree_zig_zag - initial commit of empty human-readable solution
tree_zig_zag - README - fix format to allow BSTs

Need to be able to specify a null left child, so change the format.
tree_zig_zag - generator - initial commit

A script that can generate a random BST that is not balanced.
tree_zig_zag - tests - initial commit

Two examples from the README and a large example for which I need to
create a solution to commit the answer for.
tree_zig_zag - README - typo
tree_zig_zag - generator - generate bigger trees

By picking node values that increase the chances of bigger subtrees
this commit increases the size of generated BSTs.
tree_zig_zag - solutions - initial commit of Java solution
tree_zig_zag - README - clarify format to say root on first line
tree_zig_zag - solutions - initial commit of Python solution
tree_zig_zag - tests - output3 initial commit

Used the solutions to determine what this is.