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 Rust (1.42.0) (judge verdict: Accepted)

use proconio::input;
use std::collections::HashMap;

fn main() {
    input! {
        n: usize,
        sequence: [usize; n],
        q: usize,
        pairs: [(usize, usize); q],
    }
    let mut map: HashMap<usize, usize> = HashMap::new();

    let mut sum: usize = sequence.iter().sum();

    for s in &sequence {
        if let Some(count) = map.get_mut(s) {
            *count+=1;
        } else {
            map.insert(*s, 1);
        }
    }

    for p in &pairs {
        let mut count = 0;
        if let Some(count0) = map.get_mut(&p.0) {
            if p.1 > p.0 {
                sum += (p.1 - p.0) * *count0;
            } else {
                sum -= (p.0 - p.1) * *count0;
            }
            count = *count0;
            *count0 = 0;
        }
        println!("{}", sum);
        if let Some(count1) = map.get_mut(&p.1) {
            *count1+=count;
        } else {
            map.insert(p.1, count);
        }
    }
}