mod = 998244353

N, M, Q = map(int, input().split())
A = list(map(int, input().split()))
for i in range(N):
    A[i] -= 1
sums = [0 for _ in range(N + 1)]
for i in range(N):
    sums[i + 1] = (sums[i] * M + A[i]) % mod
pow_m = [1 for _ in range(N + 1)]
for i in range(N):
    pow_m[i + 1] = (pow_m[i] * M) % mod

for i in range(Q):
    l, r = map(int, input().split())
    ans = (sums[r] - sums[l - 1] * pow_m[r - l + 1]) % mod
    print((ans + 1) % mod)