Problem:
Score : 400 points

Problem Statement

There are N integers, A_1, A_2, ..., A_N, arranged in a row in this order.

You can perform the following operation on this integer sequence any number of times:

Operation: Choose an integer i satisfying 1 \leq i \leq N-1. Multiply both A_i and A_{i+1} by -1.

Let B_1, B_2, ..., B_N be the integer sequence after your operations.

Find the maximum possible value of B_1 + B_2 + ... + B_N.

Constraints

All values in input are integers.

2 \leq N \leq 10^5

-10^9 \leq A_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 ... A_N

Output

Print the maximum possible value of B_1 + B_2 + ... + B_N.

Sample Input 1

3
-10 5 -4

Sample Output 1

19

If we perform the operation as follows:

Choose 1 as i, which changes the sequence to 10, -5, -4.

Choose 2 as i, which changes the sequence to 10, 5, 4.

we have B_1 = 10, B_2 = 5, B_3 = 4. The sum here, B_1 + B_2 + B_3 = 10 + 5 + 4 = 19, is the maximum possible result.

Sample Input 2

5
10 -4 -8 -11 3

Sample Output 2

30

Sample Input 3

11
-1000000000 1000000000 -1000000000 1000000000 -1000000000 0 1000000000 -1000000000 1000000000 -1000000000 1000000000

Sample Output 3

10000000000

The output may not fit into a 32-bit integer type.

Solution in Rust (1.15.1) (judge verdict: Accepted)

use ::std::collections::HashSet;

fn read<T: ::std::str::FromStr>() -> T {
    let mut s = String::new();
    ::std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: ::std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    ::std::io::stdin().read_line(&mut s).ok();
    s.trim().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}

pub fn main() {
    let N: i64 = read();
    let As: Vec<i64> = read_vec();
    if N == 1 {
        println!("{}", As[0].abs());
        return;
    }
    let is_include_0 = As.iter().any(|&v| v == 0);
    let is_odd: i64 = As.iter().map(|&v| if v < 0 {1} else {0}).sum();
    let sum: i64 = As.iter().map(|&v| v.abs()).sum();
    if is_include_0 || is_odd % 2 == 0 {
        println!("{}", sum);
    } else {
        let sub = As.iter().map(|&v| v.abs()).min().unwrap();
        println!("{}", sum - sub * 2);
    }
}