宝石个数

class Solution {
public:
	int numJewelsInStones(string J, string S) {
		
		//统计宝石个数
		int count = 0;

		//获得字符串长度
		int j_length = J.length();
		int s_length = S.length();

		int s = 0;
		while (s<s_length) {
			if (J.find(S[s]) != -1) {
				count++;
			}
			s++;
		}
		return count;
	}
};