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.HashMap;
import java.util.Scanner;

public class Main {

    public static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {
        int n=scanner.nextInt();
        HashMap<Integer, Integer> map
                = new HashMap<>();
        long sum =0;
        for(int j=0;j<n;j++)
        {
            Integer temp=scanner.nextInt();
            if(map.containsKey(temp))
            {
                Integer x =map.get(temp);
                x++;
                map.put(temp,x);
            }
            else
            {
                map.put(temp,1);
            }
            sum+=temp;
        }

        int q= scanner.nextInt();
        for(int j=0;j<q;j++)
        {
            Integer b=scanner.nextInt();
            Integer c=scanner.nextInt();
            if(map.containsKey(b))
            {
                Integer x;
                if(map.containsKey(c))
                {
                    x = map.get(b);
                    sum-=b*map.get(b);
                    Integer y=map.get(c);
                    y+=x;
                    sum+=x*c;
                    map.put(c,y);
                }
                else
                {
                    x = map.get(b);
                    sum-=b*map.get(b);
                    map.put(c,x);
                    sum+=c*x;
                }
                map.remove(b);

            }
            System.out.println(sum);
        }
	// write your code here
    }
}