N,M,Q=map(int,input().split())
A=list(map(int,input().split()))
u=[1]*(N+1)
mod=998244353
v=[0]*(N+1)
for i in range(1,N+1):
  u[i]=u[i-1]*M
  u[i]%=mod
u2=[1]*(N+1)
for i in range(1,N+1):
  ans=1
  w=u[i]
  n=mod-2
  while n>0:
    if n&1:
      ans*=w
      ans%=mod
    w**=2
    w%=mod
    n//=2
  u2[i]=ans
for i in range(N-1,-1,-1):
  A[i]-=1
  v[i]=v[i+1]+A[i]*u[N-1-i]
  v[i]%=mod
for i in range(Q):
  l,r=map(int,input().split())
  l-=1
  r-=1
  ans=v[l]-v[r+1]
  ans%=mod
  ans*=u2[N-1-r]
  ans+=1
  ans%=mod
  print(ans)