programmer 181921

Solution.java

import java.util.ArrayList;

class Solution {
    public int[] solution(int l, int r) {
        ArrayList<Integer> result = new ArrayList();
        
        for (int i = l; i <= r; ++i) {
            String value = String.valueOf(i);
            boolean matched = true;
            for (int j = 0; j < value.length(); ++j) {
                char current = value.charAt(j);
                if (current != '0' && current != '5') {
                    matched = false;
                    break;
                }
            }
            if (matched) {
                result.add(i);
            }
        }
        
        if (result.isEmpty()) {
            return new int[] { -1 };
        }
        
        // 스트림 버전
        return result.stream().mapToInt(it -> it).toArray();
    }
}

Solution2.java

import java.util.ArrayList;

class Solution {
    public int[] solution(int l, int r) {
        ArrayList<Integer> result = new ArrayList();
        
        for (int i = l; i <= r; ++i) {
            String value = String.valueOf(i);
            boolean matched = true;
            for (int j = 0; j < value.length(); ++j) {
                char current = value.charAt(j);
                if (current != '0' && current != '5') {
                    matched = false;
                    break;
                }
            }
            if (matched) {
                result.add(i);
            }
        }
        
        if (result.isEmpty()) {
            return new int[] { -1 };
        }
        
        // 스트림 없는 버전
        int[] answer = new int[result.size()];
        for (int i = 0; i < result.size(); ++i) {
            answer[i] = result.get(i);
        }
        
        return answer;
    }
}