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 Ruby (2.7.1) (judge verdict: Wrong Answer)

class UnionFindTree
  attr_accessor :rank, :parent

  def initialize(size)
    @rank = Array.new(size, 0)
    # @parent = (0..(size-1)).to_a
    @parent = Array.new(size, &:itself)
  end

  def unite(id_x, id_y)
    x_parent = get_parent(id_x)
    y_parent = get_parent(id_y)
    return false if x_parent == y_parent

    if @rank[x_parent] == @rank[y_parent]
      @parent[y_parent] = x_parent
      @rank[y_parent] += 1
    elsif @rank[x_parent] < @rank[y_parent]
      @parent[x_parent] = y_parent
    else # @rank[x_parent] > @rank[y_parent]
      @parent[y_parent] = x_parent
    end
    return true
  end

  def get_parent(index)
    @parent[index] == index ? index : (@parent[index] = get_parent(@parent[index]))
  end

  def same_parent?(id_x, id_y)
    get_parent(id_x) == get_parent(id_y)
  end
end

# 7 4 4   n k l
# 1 2     p_1 q_1
# 2 3
# 2 5
# 6 7     p_k q_k
# 3 5     r_1 s_1
# 4 5
# 3 4
# 6 7     r_l s_l

n, k, l = gets.split.map(&:to_i)
array_roads = k.times.map{ gets.split.map(&:to_i).map(&:pred) }
array_rails = l.times.map{ gets.split.map(&:to_i).map(&:pred) }

tree_roads = UnionFindTree.new(n)
tree_rails = UnionFindTree.new(n)
array_ans = Array.new(n, 1)

array_roads.each do |a, b|
  tree_roads.unite(a, b)
end
array_rails.each do |a, b|
  tree_rails.unite(a, b)

  if tree_roads.same_parent?(a,b)
    array_ans[a] += 1
    array_ans[b] += 1
  end
end

# n.times do |i|
#   count = 0
#   n.times do |j|
#     if tree_roads.same_parent?(i, j) && tree_rails.same_parent?(i, j)
#       count += 1
#     end
#   end
#   array_ans[i] = count
# end

puts array_ans.join(" ")