n, m, q = map(int, input().split())
mod = 998244353
A = list(map(int, input().split()))

Powm = [pow(m, i, mod) for i in range(n + 1)]
accumA = [0 for _ in range(n + 1)]
for i in range(n - 1, -1, -1):
    accumA[i] = accumA[i + 1] + (A[i] - 1) * Powm[n - 1 - i] % mod
    accumA[i] %= mod
for _ in range(q):
    l, r = map(int, input().split())
    l -= 1
    ans = (accumA[l] - accumA[r]) % mod
    ans *= pow(Powm[n - r], mod - 2, mod)
    print((ans + 1) % mod)