import sys
input = sys.stdin.readline
N,M,Q = map(int,input().split())
A = list(map(lambda x:int(x)-1,input().split()))
LR = [tuple(map(int,input().split())) for _ in range(Q)]
MOD = 998244353

powM = [1]
while len(powM) <= N:
    powM.append(powM[-1] * M % MOD)
invM = pow(M,-1,MOD)
invpowM = [1]
while len(invpowM) <= N:
    invpowM.append(invpowM[-1] * invM % MOD)

cums = [0]
for i in range(N):
    cums.append(cums[-1] + A[-1-i] * powM[i])

powM.reverse()
invpowM.reverse()
cums.reverse()

for l,r in LR:
    l -= 1
    v = cums[l] - cums[r]
    v *= invpowM[r]
    ans = (v+1) % MOD
    print(ans)