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Main.java
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Main.java
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package question;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
Solution solution = new Solution();
solution.solution("{{4,2,3},{3},{2,3,4,1},{2,3}}");
}
public static class Solution {
public int[] solution(String s) {
String[] groups = Pattern.compile("\\{(.*?)}")
.matcher(s.substring(1, s.length() - 1))
.results()
.map(MatchResult::group)
.toArray(String[]::new);
Arrays.sort(groups, Comparator.comparingInt(String::length));
List<Integer> answer = new ArrayList<>();
for(String sub : groups){
sub = sub.substring(1, sub.length() - 1);
String[] numbers = sub.split(",");
for(String number : numbers){
int num = Integer.parseInt(number);
if(!answer.contains(num))
answer.add(num);
}
}
return answer.stream().mapToInt(Integer::intValue).toArray();
}
}
}