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package ch11;

import java.util.HashSet;

import java.util.Set;

class P31_2 {

public int numJewelsInStones(String J, String S) {

int count = 0;

Set<Character> freqs = new HashSet<>();

// 보석(J) 종류 저장

for (char j : J.toCharArray())

freqs.add(j);

// 돌(S)이 보석(J)인 경우 +1

for (char s : S.toCharArray())

if (freqs.contains(s)) count++;

return count;

}

}