#![allow(unused_imports)]
#![allow(dead_code)]
#![allow(unused_variables)]
#![warn(non_snake_case)]

//use itertools::Itertools;
use std::cmp::{max, min, Reverse};
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
use std::f64::consts::PI;
use std::io::prelude::*;
use std::io::{stdin, stdout, BufWriter, Write};
use std::time::Instant;

/*
use rand::distributions::{Distribution, Uniform};
use rand_chacha::{rand_core::SeedableRng, ChaCha8Rng};
use core::ops::{Add,Sub,Mul,Div};
use itertools::Itertools;
*/

const M1: i64 = 1000_000_007;
const M2: i64 = 998244353;
fn main() {
    //let mut out: BufWriter<std::io::StdoutLock<'_>> = BufWriter::new(stdout().lock());

    input! {
        n: usize,
        m: i64,
        q: usize,
        a: [i64;n],
        lr: [(usize,usize);q]
    }

    for i in 0..q {
        let l = lr[i].0 - 1;
        let r = lr[i].1 - 1;
        let k = r - l + 1;
        let mut ans = 1;
        for j in (0..k).rev() {
            ans += (a[l + j] - 1) * pow_mod(m, ((k - 1) - j) as i64, M2) % M2;
            ans %= M2;
        }
        println!("{}", ans);
    }

    //write!(out,"{}\n",ans).unwrap();
}

pub fn pow_mod(mut a: i64, mut b: i64, m: i64) -> i64 {
    let mut res: i64 = 1;

    while b > 0 {
        if b & 1 == 1 {
            res = res * a % m;
        }
        a = a * a % m;
        b >>= 1;
    }
    res
}

pub mod my_proconio {
    #[macro_export]
    macro_rules! input {
        (source = $s:expr, $($r:tt)*) => {
            let mut iter = $s.split_whitespace();
            let mut next = || { iter.next().unwrap() };
            input_inner!{next, $($r)*}
        };
        ($($r:tt)*) => {
            let stdin = std::io::stdin();
            let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
            let mut next = move || -> String{
                bytes
                    .by_ref()
                    .map(|r|r.unwrap() as char)
                    .skip_while(|c|c.is_whitespace())
                    .take_while(|c|!c.is_whitespace())
                    .collect()
            };
            input_inner!{next, $($r)*}
        };
    }

    #[macro_export]
    macro_rules! input_inner {
        ($next:expr) => {};
        ($next:expr, ) => {};

        ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
            let $var = read_value!($next, $t);
            input_inner!{$next $($r)*}
        };

        ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
            let mut $var = read_value!($next, $t);
            input_inner!{$next $($r)*}
        };
    }

    #[macro_export]
    macro_rules! read_value {
        ($next:expr, ( $($t:tt),* )) => {
            ( $(read_value!($next, $t)),* )
        };

        ($next:expr, [ $t:tt ; $len:expr ]) => {
            (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
        };

        ($next:expr, chars) => {
            read_value!($next, String).chars().collect::<Vec<char>>()
        };

        ($next:expr, usize1) => {
            read_value!($next, usize) - 1
        };

        ($next:expr, $t:ty) => {
            $next().parse::<$t>().expect("Parse error")
        };
    }
}