C++ :

#include<bits/stdc++.h>
using namespace std;
int n,da[1000005],xiao[1000005],q,x,da1,xiao1=1000000005;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		scanf("%d",&x);
		if(x>da1) da1=x;
		da[i]=da1;
		if(x<xiao1) xiao1=x;
		xiao[i]=xiao1;
	}
	cin>>q;
	while(q--)
	{
		scanf("%d",&x);
		printf("%d ",da[x]-xiao[x]);
	}
    return 0;
}