Update README.markdown
Longest Common Substring modified
LinkedList helper changed to proper class
dp recognition added
readme updated
StringAdd test added
Readme updated
MaxLengthContiguousSequentialIntegers added
Permutation added with tests
Running Duplicate added
Running Duplicate tests added
IdenticalRotations with tests added
Package structure changed
problem list updated
Binary tree is balanced or not.
BST from sorted array with tests added