package main

import . "fmt"
import . "os"
import bf "bufio"
import . "math/big"

const Mod = 998244353

func main() {
	rd:=bf.NewReader(Stdin)
	var n,m,q int
	Fscan(rd,&n,&m,&q)
	a := make([]int, n)
	for i := range a {
		Fscan(rd,&a[i])
	}
	s := make([]int, n+1)
	mm := 1
	for i := n-1; i >= 0; i-- {
		s[i] = (s[i+1]+(a[i]-1)*mm%Mod)
		mm = mm*m%Mod
	}
	d := make([]int, n+1)
	d[0] = int(new(Int).ModInverse(NewInt(int64(mm)),NewInt(Mod)).Int64())
	for i, v := range d[:n] {
		d[i+1] = v*m%Mod
	}
	
	for ; q > 0; q-- {
		var l,r int
		Fscan(rd,&l,&r)
		ans := ((s[l-1]+Mod-s[r])%Mod*d[r]%Mod+1)%Mod
		Println(ans)
	}
}