import sys
input = sys.stdin.readline

n=int(input())
A=list(map(int,input().split()))

SUM=[0]*n
S=0

for i in range(n):
    if A[i]>0:
        S+=A[i]
        SUM[i]=S
    else:
        S=0

for i in range(n-1,-1,-1):
    if SUM[i]>0 and i+1<n and SUM[i+1]>0:
        SUM[i]=SUM[i+1]

Q=int(input())

for tests in range(Q):
    x,b=map(int,input().split())
    x-=1
    ANS=0

    if A[x]==0:
        if x-1>=0:
            ANS+=SUM[x-1]
        if x+1<n:
            ANS+=SUM[x+1]
        ANS+=b

        print(ANS)

    else:
        ANS=SUM[x]+(b-A[x])

        print(ANS)