Count DNA Subsequence
Declare and implement a method called countDNASubsequence
. It should take two nullable String
arguments:
the first a strand of DNA to examine, and the second a sequence to look for. It should return as an Int
the
number of nonoverlapping times that the sequence appears in the strand.
Both the strand and the sequence will be entirely made up of only the characters 'A', 'T', 'G', and 'C',
corresponding to the DNA base pairs.
For example, given the DNA strand AAAAAAAA
and the sequence AA
you should return 4, not 7, since the
subsequence AA
only appears 4 non-overlapping times in the strand.
If DNA
or sequence
is null
or empty you should return 0.