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: Wrong Answer)

#include<stdio.h>
 
void replace(int *K, int B, int C,unsigned long	 *sum){
   *(K + C) = *(K + B) + *(K + C);
   *sum = *sum + *(K + B)*C - *(K + B)*B ;
   *(K + B) = 0;
}
int main(){
    int N, A[100000], Q, B[100000], C[100000];
    int K[100000];
    unsigned long sum =0;
 
    for (int i=0; i< 100000;i++){
        K[i]=0;
    }
    //Nhập
    scanf("%d", &N);
    for (int i=0; i<N; i++){
        scanf("%d", &A[i]);
        K[A[i]]++;
        sum = sum + A[i];
    }
    scanf("%d", &Q);
    for (int i=0; i<Q; i++){        
        scanf("%d", &B[i]);
        scanf("%d", &C[i]);
    }
 
    //Xử lý 
    
    for (int i=0; i<Q; i++){  
        replace(K, B[i],C[i], &sum);
        printf("%d\n", sum);
    }
 
    return 0;
}