Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
problem list updated
add without arithmetic operators added and readme in the lower levels are deleted, list of the problems updated
move problem list to the top level readme
file name changed with question number
renamed the files again to add 0 in the names
change the name of 1_hashtables_arrays_strings to 1_hashtables_arrays_strings_sort
next bigger num added
remove a linked list node with only access to that node
push pop min constant time added
fcs added for binary trees
readme changes
default readme for Java added
readme styles
readme styles
readme styles testing