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Jewels And Stones (LeetCode)

Simple Programming interview question asked by Amazon, Alibaba, and other top tech companies. Solution: O(n) - Linear Time Problem Description: You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of stone you have. You want to know how many of the stones you have are also jewels. The letters in J are guaranteed distinct, and all characters in J and S are letters. Letters are case sensitive, so "a" is considered a different type of stone from "A". Example 1: Input: J = "aA", S = "aAAbbbb" Output: 3 Example 2: Input: J = "z", S = "ZZ" Output: 0 Note: S and J will consist of letters and have length at most 50. The characters in J are distinct.