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May-2 2020 Challenge

2. Jewels and Stones

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 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.

Solution in Java:

class Solution {
    public int numJewelsInStones(String J, String S) {
        int ans  = 0;
        for(int i = 0; i < S.length(); i++){
            for(int j = 0; j < J.length(); j++){
                if(J.charAt(j) == S.charAt(i)){
                    ans ++;
                    break;
                }
            }
        }
        
        return ans;
    }
}

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