#include<stdio.h>
long long int a[300005];
long long int sum[300005];
int main()
{
	long long int n;
	scanf("%lld", &n);
	long long int i;
	for (i = 0; i < n; i++)
		scanf("%lld", &a[i]);
	sum[0] = a[0];
	for (i = 1; i < n; i++)
	{
		if (a[i] > 0)
			sum[i] = sum[i - 1] + a[i];
		else
			sum[i] = 0;
	}
	for (i = n - 2; i >= 0; i--)
	{
		if (sum[i + 1] > 0 && sum[i] > 0)
			sum[i] = sum[i + 1];
	}
	long long int q, x, b;
	scanf("%lld", &q);
	for (; q > 0; q--)
	{
		scanf("%lld %lld", &x, &b);
		x--;
		b -= a[x];
		if (n == 1)
		{
			printf("%lld\n", a[0] + b);
			continue;
		}
		if (a[x] > 0)
			printf("%lld\n", sum[x] + b);
		else if (x == 0)
			printf("%lld\n", sum[x + 1] + b);
		else if (x == n - 1)
			printf("%lld\n", sum[x - 1] + b);
		else
			printf("%lld\n", sum[x + 1] + sum[x - 1] + b);
	}
	return 0;
}