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

s = [0] * (N+1)
for i in range(N):
    if N >= 24:
        s[i+1] = s[i] + A[i] - s[i-23]
    else:
        s[i+1] = s[i] + A[i]

res = max(s)

for q in range(Q):
    T, V = map(int, input().split())
    diff = V - A[T-1]
    A[T-1] = V
    for i in range(24):
        if T+i <= N:
            s[T+i] += diff
            if res <= s[T+i]:
                res = s[T+i]
    print(res)