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

ls = []
rs = []

invs = []
p = 1
for i in range(N+1):
    invs.append(pow(p, MOD-2, MOD))
    p = (p*M) % MOD

for _ in range(Q):
    l, r = map(int, input().split())
    ls.append(l)
    rs.append(r)

acc = [0]
p = 1
for i in range(N):
    acc.append((acc[-1] + (A[N-i-1]-1)*p) % MOD)
    p = (p*M) % MOD

for i in range(Q):
    l, r, = ls[i], rs[i]
    r = N-r
    l = N-l+1

    ans = ((acc[l]-acc[r])*invs[r]+1) % MOD
    print(ans)