#P9. 练3.3 01子串
练3.3 01子串
Description
For a binary string of length , each digit can be either or , resulting in a total of possibilities. The first few are:
000 001 010 ……
Please output these $8$ binary strings in ascending order.
Input Format
None.
Output Format
Output lines, each containing a binary string of length in ascending order.
Sample
None000
001
010
011
100
101
110
111