CF：Card（贪心）

H. Card

time limit per test

0.5 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

After Hasan ruined the Worm puzzle, Rula brought a new game to the office, the Card game.

The game has a group of cards, each card has an integer value Vi written on it.

Initially, N cards are placed side by side in a straight line (refer to the picture above). In each turn you will pick two adjacent card sets (a single card is also considered a card set) and merge the cards of the two sets together to form one new set.

After each turn, you will add the maximum card value in each card set to your score. The game is over when no more merges could be performed.

What is the maximum score you can get at the end of the game, given that your initial score is 0?

Input

The first line of input contains a single integer N (2 ≤ N ≤ 105), the number of cards in the game.

The second line contains N space-separated integers, each integer is Vi (1 ≤ Vi ≤ 5000), which represents the number written on the ith card.

Output

On a single line, print the maximum score you can get.

Examples

input

5
1 2 3 2 1

output

23

input

6
7 9 7 5 4 3

output

108

Note

One of the possible solutions for the first sample is as follows:

• Initially, each set will contain a single card: {1} {2} {3} {2} {1}.
• Merge {1} with {2}, the resulting sets are: {1 2} {3} {2} {1}, which will add (2 + 3 + 2 + 1 = 8) to your score.
• Merge {2} with {1}, the resulting sets are: {1 2} {3} {2 1}, which will add (2 + 3 + 2 = 7) to your score.
• Merge {1 2} with {3}, the resulting sets are: {1 2 3} {2 1}, which will add (3 + 2 = 5) to your score.
• Merge {1 2 3} with {2 1}, the resulting sets are: {1 2 3 2 1}, which will add 3 to your score.

Final score is 8 + 7 + 5 + 3 = 23.

思路：要获得最大值，肯定每次操作都将最小的值覆盖掉。

# include <iostream>
# include <cstdio>
# include <algorithm>
using namespace std;

int main()
{
    int a[100001], n;
    long long sum1, sum2;
    while(~scanf("%d",&n))
    {
        sum1 = sum2 = 0;
        for(int i=0; i<n; ++i)
        {
            scanf("%d",&a[i]);
            sum1 += a[i];
        }
        sum1 *= (n-1);
        sort(a, a+n);
        for(int i=0; i<n-1; ++i)
        {
            sum2 += a[i];
            sum1 -= sum2;
        }
        printf("%I64d\n",sum1);
    }
    return 0;
}