#!/usr/bin/env python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import itertools

N = int(readline())
A = list(map(int, readline().split()))
Q = int(readline())
m = map(int, read().split())
TV = zip(m, m)
Acum = list(itertools.accumulate(A))
A24 = Acum[23:]
for i in range(1, len(A24)):
    A24[i] -= Acum[i - 1]
best = max(A24)

for t, v in TV:
    dx = v - A[t - 1]
    A[t - 1] = v
    L = max(t - 24, 0)
    for i in range(L, min(t, len(A24))):
        A24[i] += dx
    y = max(A24[L:t])
    if best < y:
        best = y
    print(best)