[백준] 13915 Hot Air Ballooning - Data Structure / Java

graycode 2023. 6. 27. 22:20

• 문제 링크

13915번: Hot Air Ballooning

Dave is the director of the Summer school of hot air ballooning. Being a responsible director, he keeps a list of flights of each trainee in the school. After each flight, Dave appends a note to the lists of flights of each trainee participating in that pa

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• 풀이 과정

• 풀이 코드

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringBuilder sb = new StringBuilder();

        String input;
        while ((input = br.readLine()) != null) {
            int n = Integer.parseInt(input);

            Set<String> set = new HashSet<>();
            while (n-- > 0) {
                char[] arr = br.readLine().toCharArray();

                Arrays.sort(arr);

                StringBuilder group = new StringBuilder();
                char prev = ' ';
                for (char c : arr)
                    if (c != prev) group.append(prev = c);

                set.add(group.toString());
            }

            sb.append(set.size()).append("\n");
        }

        bw.write(sb.toString());
        bw.flush();
    }

}