Problem:
Score : 300 points

Problem Statement

We will play a one-player game using a number line and N pieces.

First, we place each of these pieces at some integer coordinate.

Here, multiple pieces can be placed at the same coordinate.

Our objective is to visit all of the M coordinates X_1, X_2, ..., X_M with these pieces, by repeating the following move:

Move: Choose a piece and let x be its coordinate. Put that piece at coordinate x+1 or x-1.

Note that the coordinates where we initially place the pieces are already regarded as visited.

Find the minimum number of moves required to achieve the objective.

Constraints

All values in input are integers.

1 \leq N \leq 10^5

1 \leq M \leq 10^5

-10^5 \leq X_i \leq 10^5

X_1, X_2, ..., X_M are all different.

Input

Input is given from Standard Input in the following format:

N M
X_1 X_2 ... X_M

Output

Find the minimum number of moves required to achieve the objective.

Sample Input 1

2 5
10 12 1 2 14

Sample Output 1

5

The objective can be achieved in five moves as follows, and this is the minimum number of moves required.

Initially, put the two pieces at coordinates 1 and 10.

Move the piece at coordinate 1 to 2.

Move the piece at coordinate 10 to 11.

Move the piece at coordinate 11 to 12.

Move the piece at coordinate 12 to 13.

Move the piece at coordinate 13 to 14.

Sample Input 2

3 7
-10 -3 0 9 -100 2 17

Sample Output 2

19

Sample Input 3

100 1
-100000

Sample Output 3

0

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
class Program
{
	static void Main(string[] args)
	{
		// 整数の入力
		//int N = int.Parse(Console.ReadLine());
		// スペース区切りの整数の入力
		string[] input = Console.ReadLine().Split(' ');
    int N = int.Parse(input[0]);
    int M = int.Parse(input[1]);

		// M個の地点の入力
    string[] points = Console.ReadLine().Split(' ');

    // N >= M の場合、移動する必要がないので出力は0
    if(N >= M){
      Console.WriteLine("0");
      return;
    }

		// 文字列の入力
		//string s = Console.ReadLine();

    // M個の地点をintのリストにする
    var list = new List<int>();
    for(int i =0; i<points.Length; i++){
      list.Add(int.Parse(points[i]));
    }
    // M個の地点をソートする
    list.Sort();

    // M個の地点の移動距離を一つずつ出す
    var dist = new List<long>();
    for(int i=1; i<list.Count; i++){
      long d = list[i] - list[i-1];
      dist.Add(d);
    }

    // 移動距離をソートする
    dist.Sort();
    
    // M - N個の地点だけ移動する必要があるので、最小移動回数は
    long route = 0;
    for(int i = 0; i< M-N; i++){
      route += dist[i];
    }

		//出力
		Console.WriteLine(route + "");
	}
}