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)

#![allow(
    non_snake_case,
    unused_variables,
    unused_assignments,
    unused_mut,
    dead_code
)]
use proconio::input;
//use proconio::marker::Usize1;
//use proconio::marker::Chars;
//use std::collections::HashSet;
// use std::cmp::*;
fn main() {
    input! {
        N:i64,
        A:[i64;N],
        Q:usize,
        BC:[[i64;2];Q]
    }
    let mut elements: Vec<i64> = vec![0; 100001];
    let mut s: Vec<i64> = vec![0; Q + 1];
    for a in A {
        elements[a as usize] += 1;
        s[0] += a;
    }
    let mut i = 0;
    for bc in BC {
        let t = elements[bc[0] as usize];
        elements[bc[0] as usize] = 0;
        elements[bc[1] as usize] += t;
        s[i + 1] = s[i] + t * (bc[1] - bc[0]);
        i += 1;
    }
    for j in 1..Q + 1 {
        println!("{}", s[j]);
    }
}