import java.util.Scanner; /**  * Created by fishsey on 2017/8/31.  */ public class Main
{ public static void main(String args[])
    {
        Scanner cin = new Scanner(System.in); int n,temp; while (cin.hasNext())
        {
            n = Integer.parseInt(cin.nextLine()); int maxNum=0, sums=0; while (n-- > 0)
            {
                temp = cin.nextInt();
                sums += temp;
                maxNum = Math.max(maxNum, temp);
            }
            cin.nextLine(); if (sums >= maxNum*2)
                System.out.println("Yes"); else  System.out.println("No");
        }
    }
}

第二题0%，楼主看看哪里有问题？？？