from itertools import accumulate


def accum(a: list):
    acc = list(accumulate(a))
    return lambda l, r: acc[r] - (acc[l-1] if l > 0 else 0)


N = int(input())
A = list(map(int, input().split()))

ls = [0] * N
p = 0
for i in range(N):
    ls[i] = p
    if A[i] == 0:
        p = i

rs = [0] * N
p = N-1
for i in reversed(range(N)):
    rs[i] = p
    if A[i] == 0:
        p = i

acc = accum(A)
Q = int(input())
for _ in range(Q):
    X, B = map(int, input().split())
    X -= 1

    l = ls[X]
    r = rs[X]
    res = acc(l, r) - A[X] + B
    print(res)