Jewels and Stones

1class Solution {
2    // time O(n)
3    // space O(n)
4    public int numJewelsInStones(String jewels, String stones) {
5        HashSet<Character> hashSet = new HashSet<Character>();
6        int count = 0;
7
8        for (int i = 0; i < jewels.length(); i++) {
9            hashSet.add(jewels.charAt(i));
10        }
11
12        for (int i = 0; i < stones.length(); i++) {
13            if (hashSet.contains(stones.charAt(i))) {
14                count++;
15            }
16        }
17
18        return count;
19    }
20}

1public class Solution {
2    public int NumJewelsInStones(string jewels, string stones) {
3        HashSet<char> hashSet = new HashSet<char>();
4
5        foreach (char c in jewels) {
6            hashSet.Add(c);
7        }
8
9        int count = 0;
10
11        foreach (char c in stones) {
12            if (hashSet.Contains(c)) {
13                count++;
14            }
15        }
16
17        return count;
18    }
19}