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)

// https://atcoder.jp/contests/abc171/tasks/abc171_d

use proconio::input;

fn main() {
    input! {
      n: i32,
      a_s: [usize; n],
      q: i32,
      bcs: [(usize, usize); q],
    }
    let mut acc = vec![0; 100001];
    for &a in a_s.iter() {
        acc[a] += 1;
    }
    let mut sum = acc
        .iter()
        .enumerate()
        .fold(0_u64, |pre, (i, &a)| pre + (i as u64) * (a as u64));
    for &(b, c) in bcs.iter() {
        let bb = acc[b];
        acc[c] += bb;
        acc[b] = 0;
        sum = (sum as i128 + bb as i128 * (c - b) as i128) as u64;
        println!("{}", sum);
    }
}