[Java] 코딜리티 [LESSON4] PermCheck

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
import java.util.*;

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        int arrSize = A.length;

        HashSet<Integer> hs = new HashSet<>();

        for (int i = 0; i < arrSize; i++) {
            hs.add(i + 1);
        }

        for (int i = 0; i < arrSize; i++) {
            hs.remove(A[i]);
        }

        if (hs.isEmpty()) {
            return 1;
        } else {
            return 0;
        }
    }
}

코딜리티 PermCheck 문제 풀이 Java 소스 코드