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;

class Program
{

    public static void Main( )
    {
        int N = int.Parse( Console.ReadLine( ) );
        var A = Console.ReadLine( ).Split( ).Select( int.Parse ).ToArray( );
        int Q = int.Parse( Console.ReadLine( ) );

        var Count = new int[ 100001 ];
        long sum = 0;
        for ( int i = 0; i < N; i++ )
        {
            Count[ A[ i ] ]++;
            sum += A[ i ];
        }

        int B, C;
        long addition;
        for ( int i = 0; i < Q; i++ )
        {
            var input = Console.ReadLine( ).Split( ).Select( int.Parse ).ToArray( );
            B = input[ 0 ];
            C = input[ 1 ];
            addition = ( C - B ) * Count[ B ];
            Count[ C ] += Count[ B ];
            Count[ B ] = 0;
            sum += addition;
            Console.WriteLine( sum );
        }
    }

}