from itertools import accumulate

MOD = 998244353
N, M, Q = map(int, input().split())
A = tuple(map(int, input().split()))

# a b c d
# (a-1)*M*M*M (b-1)*M*M (c-1)*M (d-1)
P = [1]
for _ in range(1, N):
  P.append(P[-1] * M % MOD)
P.reverse()
S = tuple((a-1) * p % MOD for a, p in zip(A, P))
S = tuple(s % MOD for s in accumulate(S, initial=0))

for _ in range(Q):
  L, R = map(int, input().split())
  s = (S[R] - S[L-1]) % MOD
  d = pow(M, N-R, MOD)
  print((s * pow(d, MOD-2, MOD) + 1) % MOD)