Problem:
Score : 100 points

Problem Statement

There are three houses on a number line: House 1, 2 and 3, with coordinates A, B and C, respectively.
Print Yes if we pass the coordinate of House 3 on the straight way from House 1 to House 2 without making a detour, and print No otherwise.

Constraints

0\leq A,B,C\leq 100

A, B and C are distinct integers.

Input

Input is given from Standard Input in the following format:

A B C

Output

Print Yes if we pass the coordinate of House 3 on the straight way from House 1 to House 2 without making a detour, and print No otherwise.

Sample Input 1

3 8 5

Sample Output 1

Yes

We pass the coordinate 5 on the straight way from the house at coordinate 3 to the house at coordinate 8.

Sample Input 2

7 3 1

Sample Output 2

No

Sample Input 3

10 2 4

Sample Output 3

Yes

Sample Input 4

31 41 59

Sample Output 4

No

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Threading.Tasks;
class program{
  static void Main(string[] args){
    program p = new program();
    p.Run();
  }
  void Run(){
	int n = int.Parse(Console.ReadLine());
    string s = Console.ReadLine();
    int m=n;
    int[] l=new int[n+1];
    int[] r=new int[n+1];
    
    Parallel.For(0,n+1,(i,state)=>{
      l[i]=lookup(s.Substring(0,i),"#");
      r[i]=lookup(s.Substring(i,n-i),".");
      if(l[i]+r[i]<m){
        m=l[i]+r[i];
      }
      if(m==0){
        state.Stop();
      }
    });
    Console.WriteLine(m.ToString());
    
  }
  
  int lookup(string s,string c){
    return s.Length - s.Replace(c,"").Length;
  }
}