Discussion @ 1501. Sense of Beauty @ Timus Online Judge

I Got WA#1. But my algo passes the following three test cases. Kingway Jin 13 Dec 2006 09:27

=========== Input =====================
Sample input #1
4
0011
0110

Sample input #2
4
1100
1100

Sample input #3
6
101010
101010

============= Output =================
Sample output #1
22121112

Sample output #2
Impossible

Sample output #3
111111222222

Re: I Got WA#1. But my algo passes the following three test cases. Kingway Jin 15 Dec 2006 12:33

OK. I found that my program gave me the wrong answer when the input is as follow:

1
0
0

I fixed this, and I still got WA#1. I need some hints.

Re: I Got WA#1. But my algo passes the following three test cases. valdem 10 Mar 2007 18:10

n>=4 !

Discussion of Problem 1501. Sense of Beauty