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backtracking_01759_makePassword.java
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backtracking_01759_makePassword.java
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package backtracking;
import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;
/**
* 1. 문제 링크: https://www.acmicpc.net/problem/1759
*/
public class backtracking_01759_makePassword {
static int L, C;
static char[] arr;
static void backtracking(int start, int len, int vowel, int consonant, String str) {
if (len == L && vowel >= 1 && consonant >= 2) {
System.out.println(str);
return;
}
for (int i = start; i < C; i++) {
if (isVowel(arr[i])) {
backtracking(i + 1, len + 1, vowel + 1, consonant, str + arr[i]);
} else {
backtracking(i + 1, len + 1, vowel, consonant + 1, str + arr[i]);
}
}
}
static boolean isVowel(char c) {
return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
L = Integer.parseInt(st.nextToken());
C = Integer.parseInt(st.nextToken());
String[] line = br.readLine().split(" ");
arr = new char[C];
for (int i = 0; i < C; i++) {
arr[i] = line[i].charAt(0);
}
Arrays.sort(arr);
backtracking(0, 0, 0, 0, "");
br.close();
}
}