- Time limit: 1.00 s
- Memory limit: 512 MB
The first input line has two integers $n$ and $m$: the number of pupils and friendships. The pupils are numbered $1,2,\dots,n$.
Then, there are $m$ lines describing the friendships. Each line has two integers $a$ and $b$: pupils $a$ and $b$ are friends.
Every friendship is between two different pupils. You can assume that there is at most one friendship between any two pupils.
Print an example of how to build the teams. For each pupil, print "1" or "2" depending on to which team the pupil will be assigned. You can print any valid team.
If there are no solutions, print "IMPOSSIBLE".
- $1 \le n \le 10^5$
- $1 \le m \le 2 \cdot 10^5$
- $1 \le a,b \le n$
1 2 2 1 2