Codility:PermCheck

public int solution(int[] A)
        {
            // write your code in C# 6.0 with .NET 4.5 (Mono)

            int N = A.Length;
            HashSet<int> wzorzecHashSet = new HashSet<int>();
            for (int i = 1; i <= N + 1; i++)
            {
                wzorzecHashSet.Add(i);
            }

            HashSet<int> setA = new HashSet<int>(A);
            int SetCount = setA.Count;
            if (setA.SetEquals(wzorzecHashSet))
                return 1;
            else
            {
                return 0;    
            }
            
        }

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