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 std::io::stdin;

fn main() {
    let n : i64 = {
        let mut buf = String::new();
        stdin().read_line(&mut buf).unwrap();
        buf.trim_end().parse().unwrap()
    };
    let a : Vec<i64>= {
        let mut buf = String::new();
        stdin().read_line(&mut buf).unwrap();
        buf.split_whitespace().filter_map(|x| x.parse().ok()).collect()
    };
    let mut count = vec![0; 100001];
    let mut sum : i64 = 0;
    for x in a {
        count[x as usize] += 1;
        sum += x;
    }
    let q = {
        let mut buf = String::new();
        stdin().read_line(&mut buf).unwrap();
        buf.trim_end().parse().unwrap()
    };
    for _ in 0..q {
        let v : Vec<_>= {
            let mut buf = String::new();
            stdin().read_line(&mut buf).unwrap();
            buf.split_whitespace()
                .filter_map(|x| x.parse::<i64>().ok())
                .collect()
        };
        if let &[b, c, ..] = v.as_slice() {
            sum -= count[b as usize] * b;
            sum += count[b as usize] * c;
            count[c as usize] += count[b as usize];
            count[b as usize] = 0;
            println!("{}", sum);
        }
    }

}