Design and implement a data structure for a compressed string iterator. It should support the following operations:
next
and
hasNext
.
The given compressed string will be in the form of each letter followed by a positive integer representing the number of this letter existing in the original uncompressed string.
next()
- if the original string still has uncompressed characters, return the next letter; Otherwise return a white space.
hasNext()
- Judge whether there is any letter needs to be uncompressed.
Note:
Please remember to
RESET
your class variables declared in StringIterator, as static/class variables are
persisted across multiple test cases
. Please see
here
for more details.
Example:
StringIterator iterator = new StringIterator("L1e2t1C1o1d1e1"); iterator.next(); // return 'L' iterator.next(); // return 'e' iterator.next(); // return 'e' iterator.next(); // return 't' iterator.next(); // return 'C' iterator.next(); // return 'o' iterator.next(); // return 'd' iterator.hasNext(); // return true iterator.next(); // return 'e' iterator.hasNext(); // return false iterator.next(); // return ' '