def main():
    import sys
    input = sys.stdin.buffer.readline

    N = int(input())
    A = list(map(int, input().split()))
    B = [0] * (N-24+1)
    B[0] = sum(A[:24])
    for i in range(1, len(B)):
        B[i] = B[i-1] + A[i+24-1] - A[i-1]
    M = max(B)
    for _ in range(int(input())):
        t, v = map(int, input().split())
        t -= 1
        d = v - A[t]
        A[t] = v
        for i in range(max(0, t - 23), min(N-23, t+1)):
            B[i] += d
            M = max(M, B[i])
        print(M)


if __name__ == '__main__':
    main()