백준 1759 암호 만들기(Java)

https://www.acmicpc.net/problem/1759

1759번: 암호 만들기

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Java 코드

 

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import java.util.Scanner;
import java.util.Arrays;

public class Main {

  static int l;
  static int c;
  static String[] list;
  static String[] arr;
  static boolean[] visit;
  static StringBuilder sb = new StringBuilder();

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    l = sc.nextInt();
    c = sc.nextInt();
    list = new String[c];
    arr = new String[c];
    visit = new boolean[c];
    for(int i = 0; i < c; i++) list[i] = sc.next();
    Arrays.sort(list);

    dfs(0, 0);
    
    System.out.println(sb);
  }

  public static void dfs(int dep, int start) {
    if(dep == l) {
      if(check() == true) {
        for(int i = 0; i < l; i++) sb.append(arr[i]);
        sb.append("\n");
        return;
      }
    }

    for(int i = start; i < c; i++) {
      if(visit[i] == false) {
        visit[i] = true;
        arr[dep] = list[i];
        dfs(dep + 1, i);
        visit[i] = false;
      }
    }
  }

  public static boolean check() {
    int a = 0;
    int b = 0;
    for(int i = 0; i < l; i++) {
      if(arr[i].equals("a") || arr[i].equals("e") || arr[i].equals("i") || arr[i].equals("o") || arr[i].equals("u")) a++;
      else b++;
    }
    if(a >= 1 && b >= 2) return true;
    else return false;
  }
}