Problem:
Score : 400 points

Problem Statement

You have a sequence A composed of N positive integers: A_{1}, A_{2}, \cdots, A_{N}.

You will now successively do the following Q operations:

In the i-th operation, you replace every element whose value is B_{i} with C_{i}.

For each i (1 \leq i \leq Q), find S_{i}: the sum of all elements in A just after the i-th operation.

Constraints

All values in input are integers.

1 \leq N, Q, A_{i}, B_{i}, C_{i} \leq 10^{5}

B_{i} \neq C_{i}

Input

Input is given from Standard Input in the following format:

N
A_{1} A_{2} \cdots A_{N}
Q
B_{1} C_{1}
B_{2} C_{2}
\vdots
B_{Q} C_{Q}

Output

Print Q integers S_{i} to Standard Output in the following format:

S_{1}
S_{2}
\vdots
S_{Q}

Note that S_{i} may not fit into a 32-bit integer.

Sample Input 1

4
1 2 3 4
3
1 2
3 4
2 4

Sample Output 1

11
12
16

Initially, the sequence A is 1,2,3,4.

After each operation, it becomes the following:

2, 2, 3, 4

2, 2, 4, 4

4, 4, 4, 4

Sample Input 2

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

Sample Output 2

8
4
4

Note that the sequence A may not contain an element whose value is B_{i}.

Sample Input 3

2
1 2
3
1 100
2 100
100 1000

Sample Output 3

102
200
2000

Solution in Ruby (2.7.1) (judge verdict: Accepted)

N = $stdin.gets.to_i
A = $stdin.gets.split.map {|i| i.to_i }
$a_map = {}
$sum = 0
A.each_with_index do |a, i|
  $a_map[a] ||= 0
  $a_map[a] += 1
  $sum += a
end
Q = $stdin.gets.to_i
B = []
C = []
0.upto(Q - 1) do |i|
  b, c = $stdin.gets.split.map {|j| j.to_i }
  B[i] = b
  C[i] = c
end

def repl(i)
  b = B[i]
  c = C[i]
  b_count = $a_map.delete(b)
  if !b_count
    return
  end
  $sum -= b * b_count
  $a_map[c] ||= 0
  $a_map[c] += b_count
  $sum += c * b_count
end

#$stderr.puts "#{$sum}, #{$a_map.to_s}"
0.upto(Q - 1) do |i|
  repl(i)
  #$stderr.puts "#{$sum}, #{$a_map.to_s}"
  puts $sum
end