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 (GCC 9.2.1) (judge verdict: Accepted)

#include<stdio.h>

#define num 100000

int main(void)
{
  long int n;
  scanf("%ld", &n);

  long int a[n];
  for(int i=0;i<n;i++){
    scanf("%ld", &a[i]);
  }

  long int q;
  scanf("%ld", &q);

  long int b[q], c[q];
  for(int i=0;i<q;i++){
    scanf("%ld %ld", &b[i], &c[i]);
  }

  long int sum=0;
  for(int i=0;i<n;i++){
    sum += a[i];
  }
  
  long int d[num+1];
  for(int i=0;i<=num;i++){
    d[i] = 0;
  }
  
  long int tmp;
  for(int i=0;i<n;i++){
    tmp = a[i];
    d[tmp]++;
  }
  
  long int before, after;
  long int s[q];
  for(int i=0;i<q;i++){
    before = b[i];
    after = c[i];
    if(i==0){
      s[0] = sum + (after-before)*d[before];
    }
    else{
      s[i] = s[i-1] +(after-before)*d[before];
    }
    d[after] += d[before];
    d[before] = 0;
  }

  for(int i=0;i<q;i++){
    printf("%ld\n", s[i]);
  }

  return 0;
}