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 1.8.0) (judge verdict: Wrong Answer)

import java.io.PrintWriter;
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		PrintWriter pw = new PrintWriter(System.out);
		
		int N = sc.nextInt();
		HashMap<Integer, Integer> map = new HashMap<>();
		
		for(int i=0; i<N; i++) {
			int A = sc.nextInt();
			if(map.get(A)==null) {
				map.put(A, 1);
			} else {
				map.put(A, map.get(A)+1);
			}
		}
		
		long ans = 0;
		for(int key : map.keySet()) {
			ans += (long)key*map.get(key);
		}
		
		int Q = sc.nextInt();
		for(int i=0; i<Q; i++) {
			int B = sc.nextInt();
			int C = sc.nextInt();
			if(map.get(B) != null) {
				int v = map.get(B);
				ans += (long)(C-B)*v;
				if(map.get(C)==null) {
					map.put(C, v);
				} else {
					map.put(C, v+map.get(C));
				}
			}
			pw.println(ans);
		}
		
		sc.close();
		pw.close();
	}
}