Jewels and Stones

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.

Discuss

比较简单的题目，直接遍历就可以了。

Code

class Solution {

    public int numJewelsInStones(String J, String S) {

        int count = 0;

        for (int i = 0; i < S.length(); i++) {

            char aa = S.charAt(i);

            for (int j = 0; j < J.length(); j++) {

                char bb = J.charAt(j);

                if (aa == bb) { count++; }

            }

        }

        return count;

    }

}