from itertools import accumulate
import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
A = list(map(int, input().split()))
Q = int(input())
query = tuple(tuple(map(int, input().split())) for _ in range(Q))

B = [0] + list(accumulate(A))
B = [r - l for l, r in zip(B, B[24:])]
ans = max(B)

for t, v in query:
    up = v - A[t - 1]
    A[t - 1] = v
    L = max(0, t - 24)
    R = min(len(B), t)
    for i in range(L, R):
        B[i] += up
        ans = max(ans, B[i])
    print(ans)