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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int count = 0;
		ArrayList<Long> list = new ArrayList<Long>();

		for(int i = 0;i < n;i++) {
			list.add(scan.nextLong());
		}

		int q = scan.nextInt();
		ArrayList<Long> befor = new ArrayList<Long>();
		ArrayList<Long> after = new ArrayList<Long>();
		ArrayList<Long> distance = new ArrayList<Long>();
		long sum = 0;

		for(int i = 0;i < n;i++) {
			sum += list.get(i);
		}

		for(int i = 0;i < q;i++) {
			befor.add(scan.nextLong());
			after.add(scan.nextLong());
			distance.add(after.get(i) - befor.get(i));
		}

		for(int j = 0;j < q;j++) {
			for(int i = 0;i < n;i++) {
				if(list.get(i) == befor.get(j)) {
					list.set(i , after.get(j));
					count++;
				}
			}
			sum += distance.get(j) * count;
			System.out.println(sum);
			count = 0;
		}
	}
}