Leetcode Everyday: 771. Jewels and Stones. Easy

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public class Solution {     public int NumJewelsInStones(string jewels, string stones) {         var list =             from stone in stones             where jewels.Any(jewel => stone == jewel)             select stone;                   return list.Count();     } }

Source: https://leetcode.com/problems/jewels-and-stones/