Restructured CYK Algo

Added Phi symbols and restructured code for CYK Algo for the substring algorithm

Left and Right Closure for CFG

This code contains both left and right closure of the CFG.

Left Closure for CFG

This release contains the Java code for calculating and displaying Left Closure of CFG.

CYK algorithm for string acceptance

This is the Java implementation of the CYK Algorithm for checking the acceptance of a string by the given Context Free Grammar.
In this version, the Grammar and the entered string are both static and hardcoded.