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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace AtCoderPractice
{
    class Replacing
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            ulong[] a = Console.ReadLine().Split().Select(ulong.Parse).ToArray();
            var q = int.Parse(Console.ReadLine());
            int[,] bc = new int[q,2];
            ulong sum = 0;
            int[] num = new int[100001];

            for(int i = 0; i < q; i++)
            {
                var input = Console.ReadLine().Split();
                bc[i, 0] = int.Parse(input[0]);
                bc[i, 1] = int.Parse(input[1]);
            }

            foreach(var x in a)
            {
                num[x]++;
                sum += x;
            }

            for(int i = 0; i < q; i++)
            {
                sum += (ulong)((bc[i, 1]- bc[i, 0]) * num[bc[i, 0]]);;
                num[bc[i, 1]] += num[bc[i, 0]];
                num[bc[i, 0]] -= num[bc[i, 0]];
                Console.WriteLine(sum);
            }
        }
    }
}