correct me if i am wrong but it is possible with 100 size

frequency array-

class Solution

{ static void Main(String[] args) {

    int n = Convert.ToInt32(Console.ReadLine());

    String s1_temp = Console.ReadLine();

    int m = Convert.ToInt32(Console.ReadLine());

    String s2_temp = Console.ReadLine();

   int[] s1 = Array.ConvertAll(s1_temp.Split(' '), int.Parse);

   int[] s2 = Array.ConvertAll(s2_temp.Split(' '),int.Parse);

   int max=s2.Max();

   int min =max-100;

   int[] hitcount=new int[101]; 

    for(int i=0;i<s2.Length;i++)
    {
        hitcount[s2[i]-min]++;
    }

    for(int j=0;j<s1.Length;j++)
    {
        hitcount[s1[j]-min]--;
    }

    for(int k=0;k<hitcount.Length;k++)
    {
        if(hitcount[k]!=0)
        {
            Console.Write((k+min)+" ");
        }
    }

}

}