n, m, q = map(int, input().split())
a = list(map(int, input().split()))
for i in range(n):
	a[i] -= 1
mod = 998244353
sm = [0]
now = 1
pw = [now]
for i in a[::-1]:
	sm.append(sm[-1] + i * now)
	now = now * m % mod
	pw.append(now)
sm = sm[::-1]
for _ in range(q):
	l, r = map(int, input().split())
	l -= 1
	print((1 + (sm[l] - sm[r]) * pow(pw[n - r], mod - 2, mod)) % mod)