JAVA: Added CheckBST.java
JAVA: Added CheckBST.java

lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets,lemming-life/Snippets