Add Jewels and Stones

Author: ocimen

LeetCode/771-JewelsAndStones.cs

@@ -0,0 +1,18 @@
+//Problem: https://leetcode.com/problems/jewels-and-stones/
+using System.Collections.Generic;
+
+namespace LeetCode {
+ public partial class Solution {
+ public int NumJewelsInStones(string jewels, string stones) {
+ var hashSet = new HashSet<char>(jewels);
+ int count = 0;
+ for(int i= 0; i < stones.Length; i++) {
+ if(hashSet.Contains(stones[i])) {
+ count++;
+ }
+ }
+ 
+ return count;
+ }
+ }
+}

README.md

@@ -7,6 +7,7 @@ LeetCode C# solutions
 |**344**| **[Reverse String](https://leetcode.com/problems/reverse-string/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/344-ReverseString.cs)** | **Easy** |
 |**509**| **[Fibonacci Number](https://leetcode.com/problems/fibonacci-number/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/509-FibonacciNumber.cs)** | **Easy** |
 |**682**| **[Baseball Game](https://leetcode.com/problems/baseball-game/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/682-BaseballGame.cs)** | **Easy** |
+|**771**| **[Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/771-JewelsAndStones.cs)** | **Easy** |
 |**933**| **[Number of Recent Calls](https://leetcode.com/problems/number-of-recent-calls/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/933-NumberofRecentCalls.cs)** | **Easy** |
 |**1108**| **[Defanging an IP Address](https://leetcode.com/problems/defanging-an-ip-address/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/1108-DefangingAnIPAddress.cs)** | **Easy** |
 |**1290**| **[Convert Binary Number in a Linked List to Integer](https://leetcode.com/problems/convert-binary-number-in-a-linked-list-to-integer/)** | **[C#](https://github.com/ocimen/leetcode/blob/main/LeetCode/1290-ConvertBinaryNumberLinkedListInteger.cs)** | **Easy** |