import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
input = sys.stdin.readline
#n = int(input())
#a = list(map(int,input().split()))
#a = []
#s = input()
#n,m = map(int,input().split())
#for i in range(n):
#    a.append(list(map(int,input().split())))
class UnionFind():
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n

    def find(self, x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]

    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)

        if x == y:
            return

        if self.parents[x] > self.parents[y]:
            x, y = y, x

        self.parents[x] += self.parents[y]
        self.parents[y] = x

    def size(self, x):
        return -self.parents[self.find(x)]

    def same(self, x, y):
        return self.find(x) == self.find(y)

    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]

    def roots(self):
        return [i for i, x in enumerate(self.parents) if x < 0]

    def group_count(self):
        return len(self.roots())

    def all_group_members(self):
        group_members = collections.defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members

    def __str__(self):
        return ''.join(f'{r}: {m}' for r, m in self.all_group_members().items())
n = int(input())
a = list(map(int,input().split()))
q = int(input())
cnt = [0 for i in range(n)]
uf = UnionFind(n)
for i in range(n-1):
    if a[i] > 0 and a[i+1] > 0:
        uf.union(i,i+1)
for i in range(n):
    cnt[uf.find(i)] += a[i]

for i in range(q):
    x,b = map(int,input().split())
    x -= 1
    if a[x] > 0:
        print(cnt[uf.find(x)] - a[x] + b)
    else:
        ans = 0
        if x-1 >= 0:
            ans += cnt[uf.find(x-1)]
        if x+1 < n:
            ans += cnt[uf.find(x+1)]
        ans += b
        print(ans)