N = int(input())
A = [0]+list(map(int,input().split()))
B = [0]*(N+1)
i = 0
flag = 0
cnt = 0
while i<N+1:
    if A[i]==0 and flag>0:
        for j in range(flag,i):
            B[j] = cnt
        cnt = 0
        flag = 0
    elif A[i]>0 and flag==0:
        flag = i
        cnt += A[i]
    elif A[i]>0 and flag>0:
        cnt += A[i]
    i += 1
if flag:
    for j in range(flag,N+1):
        B[j] = cnt
Q = int(input())
for _ in range(Q):
    x,b = map(int,input().split())
    if B[x]>0:
        print(B[x]+b-A[x])
    else:
        print(b+B[x-1]+B[x+1])