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: Accepted)

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        HashMap<Integer, Integer> map = new HashMap<>();
        for(int i = 0; i < n; i++){
            int a = sc.nextInt();
            map.put(a, map.getOrDefault(a, 0) + 1);
        }

        int q = sc.nextInt();

        StringBuilder sb = new StringBuilder();

        long ans = 0;

        for(int i = 0; i < q; i++){
            int b = sc.nextInt();
            int c = sc.nextInt();

            int bNum = 0;
            if(map.containsKey(b)){
                bNum = map.get(b);
                if(map.containsKey(c)){
                    map.put(c, map.get(c) + bNum);
                }else{
                    map.put(c, bNum);
                }

                map.remove(b);
            }

            if(ans == 0){
                for(Integer j : map.keySet()){
                    //System.out.println(j + " "+ map.get(j));
                    ans += map.get(j) * (long)j;
                }
            }else{
                ans += (c - b) * bNum;
            }

            sb.append(ans).append("\n");
            //System.out.println(ans);

        }
        System.out.println(sb);

    }
}