1 /// <summary>
2 /// Solution A
3 /// 100/100
4 /// </summary>
5 /// <param name="A"></param>
6 /// <returns></returns>
7 public static int solution(int[] A)
8 {
9 if (A.Length == 0) return 0;
10 int result = 1;
11 Array.Sort(A);
12 for (int i = 1; i < A.Length; i++)
13 {
14 if (A[i] != A[i - 1])
15 result++;
16 }
17 return result;
18 }
19
20 /// <summary>
21 /// Solution B
22 /// 100/100
23 /// </summary>
24 /// <param name="A"></param>
25 /// <returns></returns>
26 public static int solution(int[] A)
27 {
28 HashSet<int> hs = new HashSet<int>();
29 foreach (int num in A)
30 {
31 hs.Add(num);
32 }
33 return hs.Count;
34 }
