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;

public class Hello
{
    public static void Main()
    {
        hoge();
        //System.Console.ReadLine();
    }

     public static void hoge()
    {
        var n = long.Parse(System.Console.ReadLine());
        var a = System.Console.ReadLine().Split(' ').Select(long.Parse).ToArray();
        var vlst = new Dictionary<long, long>();
        foreach(var v in a)
        {
            if (vlst.ContainsKey(v))
            {
                vlst[v]++;
            }
            else
            {
                vlst.Add(v, 1);
            }
        }
        var q = long.Parse(System.Console.ReadLine());

        var sum = a.Sum();
        var query = a.AsEnumerable();
        Dictionary<long, long> dic = new Dictionary<long, long>();

        for(long i = 0; i < q; i++)
        {
            var var = System.Console.ReadLine().Split(' ').Select(long.Parse).ToArray();
            var b = var[0];
            var c = var[1];
            if (!vlst.ContainsKey(b))
            {
                vlst.Add(b, 0);
            }
            var sa = c - b;
            sa *= vlst[b];
            sum += sa;
            Console.WriteLine(sum);
            if (!vlst.ContainsKey(c))
            {
                vlst.Add(c, 0);
            }
            vlst[c] += vlst[b];
            vlst[b] = 0;
        }

    }
}