use std::{
    cmp::min, io::{read_to_string, stdin, stdout, Write},
};

fn main() {
    let temp = read_to_string(stdin()).unwrap();
    let mut iter = temp
        .split_ascii_whitespace()
        .map(|x| x.parse::<usize>().unwrap());

    let (n, m, q) = (
        iter.next().unwrap(),
        iter.next().unwrap(),
        iter.next().unwrap(),
    );

    let mut lock = stdout().lock();

    let mut bfs = (0..m).map(|_| iter.next().unwrap()).collect::<Vec<_>>();
    bfs.sort();

    let dist = |a: usize, b: usize| -> usize {
        let d = if a > b { a - b } else { b - a };
        min(d, 2 * n - d)
    };

    for _ in 0..q {
        let (mut x, mut y) = (iter.next().unwrap(), iter.next().unwrap());
        if x > y {
            (x, y) = (y, x);
        }
        let delta = y - x;

        let mut r = min(delta, 2 * n - delta);

        let (px, py) = (x % n, y % n);

        let ix = bfs.partition_point(|&k| k < px);
        let iy = bfs.partition_point(|&k| k < py);

        let cands = [(ix + m - 1) % m, ix % m, (iy + m - 1) % m, iy % m];

        for &cand in &cands {
            let k = bfs[cand];
            let u = k;
            let v = k + n;
            let d1 = dist(x, u) + dist(v, y) + 1;
            let d2 = dist(x, v) + dist(u, y) + 1;
            r = min(r, d1);
            r = min(r, d2);
        }

        writeln!(lock, "{}", r).unwrap();
    }
}