Problem:
Score : 400 points

Problem Statement

There are N cities. There are also K roads and L railways, extending between the cities.
The i-th road bidirectionally connects the p_i-th and q_i-th cities, and the i-th railway bidirectionally connects the r_i-th and s_i-th cities.
No two roads connect the same pair of cities. Similarly, no two railways connect the same pair of cities.

We will say city A and B are connected by roads if city B is reachable from city A by traversing some number of roads. Here, any city is considered to be connected to itself by roads.
We will also define connectivity by railways similarly.

For each city, find the number of the cities connected to that city by both roads and railways.

Constraints

2 ≦ N ≦ 2*10^5

1 ≦ K, L≦ 10^5

1 ≦ p_i, q_i, r_i, s_i ≦ N

p_i < q_i

r_i < s_i

When i ≠ j, (p_i, q_i) ≠ (p_j, q_j)

When i ≠ j, (r_i, s_i) ≠ (r_j, s_j)

Input

The input is given from Standard Input in the following format:

N K L
p_1 q_1
:
p_K q_K
r_1 s_1
:
r_L s_L

Output

Print N integers. The i-th of them should represent the number of the cities connected to the i-th city by both roads and railways.

Sample Input 1

4 3 1
1 2
2 3
3 4
2 3

Sample Output 1

1 2 2 1

All the four cities are connected to each other by roads.

By railways, only the second and third cities are connected. Thus, the answers for the cities are 1, 2, 2 and 1, respectively.

Sample Input 2

4 2 2
1 2
2 3
1 4
2 3

Sample Output 2

1 2 2 1

Sample Input 3

7 4 4
1 2
2 3
2 5
6 7
3 5
4 5
3 4
6 7

Sample Output 3

1 1 2 1 2 2 2

Solution in Scala (2.11.7) (judge verdict: Accepted)

import java.io.{BufferedReader, IOException, InputStream, InputStreamReader}
import java.util.StringTokenizer

import scala.collection.mutable
import scala.util.Sorting
import math.{abs, max, min}
import scala.collection.mutable.ArrayBuffer

object Main {
  def solve(): Unit = {
    val sc = new InputReader(System.in)
    val N = sc.nextInt()
    val K = sc.nextInt()
    val L = sc.nextInt()

    var i = 0
    val uf_road = new UnionFind(N + 1)
    i = 0
    while (i < K) {
//    (0 until K) foreach { _ =>
      uf_road.unite(sc.nextInt(), sc.nextInt())
      i += 1
    }

    val uf_rail = new UnionFind(N + 1)
    i = 0
    while (i < L) {
//    (0 until L) foreach { _ =>
      uf_rail.unite(sc.nextInt(), sc.nextInt())
      i += 1
    }

    val group = new java.util.HashMap[(Int, Int), Int](N) // key => group
    i = 1
    while (i <= N) {
//    (1 to N) foreach { i =>
      val k = (uf_road.find(i), uf_rail.find(i))
      group.put(k, i)
      i += 1
    }
    val i2g = Array.ofDim[Int](N + 1) // i => group
    i = 1
    while (i <= N) {
//    (1 to N) foreach { i =>
      val k = (uf_road.find(i), uf_rail.find(i))
      i2g(i) = group.get(k)
      i += 1
    }
    val count = Array.ofDim[Int](N + 1) // group => count
    i = 1
    while (i <= N) {
//    (1 to N) foreach { i =>
      count(i2g(i)) += 1
      i += 1
    }
    i = 1
    while (i <= N) {
//    (1 to N) foreach { i =>
      if (i > 1) print(" ")
      print(count(i2g(i)))
      i += 1
    }

//    val count = mutable.Map[(Int, Int), Int]()
//    var i = 1
//    while(i <= N) {
//      val k = key(i)
//      if (!(count contains k)) count(k) = 0
//      count(k) = count(k) + 1
//      i += 1
//    }
//
//    i = 1
//    while(i <= N) {
//      if (i > 1) print(" ")
//      print(count(key(i)))
//      i += 1
//    }
//    println()
//    val count = ((1 to N) map key).groupBy(identity).mapValues(_.size)
//    val ans = ((1 to N) map (key _).andThen (count(_))).mkString(" ")
//    println(ans)
  }

  def main(args: Array[String]): Unit = {
    solve()
  }



  class InputReader(val stream: InputStream) {
    val reader = new BufferedReader(new InputStreamReader(stream), 32768)
    var tokenizer: StringTokenizer = null

    def next: String = {
      while (tokenizer == null || !tokenizer.hasMoreTokens)
        tokenizer = new StringTokenizer(reader.readLine)
      tokenizer.nextToken
    }

    def nextInt(): Int = next.toInt
    def nextLong(): Long = next.toLong
    def nextChar(): Char = next.charAt(0)
  }

  class UnionFind(n: Int) {
    private val par = Array.ofDim[Int](n)
    (0 until n) foreach (i => par(i) = i)
    private val rank = Array.ofDim[Int](n)

    def find(x: Int): Int = {
      if (par(x) == x) x
      else {
        par(x) = find(par(x))
        par(x)
      }
    }

    def unite(x: Int, y: Int): Unit = {
      val x1 = find(x)
      val y1 = find(y)
      if (x1 != y1) {
        if (rank(x1) < rank(y)) {
          par(x1) = y1
        } else {
          par(y1) = x1
          if (rank(x1) == rank(y1)) rank(x1) += 1
        }
      }
    }
  }
}