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CSES Problem Set

Planets and Kingdoms

Task | Statistics

CSES - Planets and KingdomsCSES - Planets and Kingdoms

Time limit:1.00 s Memory limit:512 MB

A game has $n$ planets, connected by $m$ teleporters. Two planets $a$ and $b$ belong to the same kingdom exactly when there is a route both from $a$ to $b$ and from $b$ to $a$. Your task is to determine for each planet its kingdom.


The first input line has two integers $n$ and $m$: the number of planets and teleporters. The planets are numbered $1,2,\dots,n$.

After this, there are $m$ lines describing the teleporters. Each line has two integers $a$ and $b$: you can travel from planet $a$ to planet $b$ through a teleporter.


First print an integer $k$: the number of kingdoms. After this, print for each planet a kingdom label between $1$ and $k$. You can print any valid solution.


5 6
1 2
2 3
3 1
3 4
4 5
5 4

1 1 1 2 2