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 Scala (2.13.1) (judge verdict: Time Limit Exceeded)

object Main {
  def main(args: Array[String]): Unit = {
    val number_of_piece = io.StdIn.readInt
    val numbers         = io.StdIn.readLine.split( " " ).map{_.toInt}
    val operation_num   = io.StdIn.readInt

    var operations: Vector[ ( Int, Int ) ] = Vector.empty
    var nums_map: Map[ Int, Int ]          = Map.empty

    ( 0 until operation_num ).foreach { i =>
      val operation = io.StdIn.readLine.split( " " ).map{_.toInt}
      operations = operations :+ ( operation( 0 ), operation( 1 ) )
    }

    numbers.foreach { i =>
      if( nums_map.contains( i ) ) nums_map += i -> ( nums_map( i ) + 1 )
      else                         nums_map += i -> 1
    }


    operations.foreach { i =>
      if( nums_map.contains( i._1 ) ) {
        if( nums_map.contains( i._2 ) ) nums_map += i._2 -> ( nums_map( i._1 ) + nums_map( i._2 ) )
        else                          nums_map += i._2 -> nums_map( i._1 )
        nums_map += i._1 -> 0
      }

      println( calcSumOfNumsMap( nums_map ) )
    }
  }

  def calcSumOfNumsMap( nums_map: Map[ Int, Int ] ): Long = {
    var sum = 0.toLong

    nums_map.foreach{ i =>
      sum += ( i._1 * i._2 ).toLong
    }

    return sum
  }
}