[20251130] BOJ / G5 / 암호 만들기 / 강신지

Author: ksinji

ksinji/202511/30 BOJ 암호 만들기.md

@@ -0,0 +1,60 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int l, c;
+    static char[] chars;
+    static char[] selected;
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        l = Integer.parseInt(st.nextToken());
+        c = Integer.parseInt(st.nextToken());
+
+        chars = new char[c];
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < c; i++) {
+            chars[i] = st.nextToken().charAt(0);
+        }
+
+        Arrays.sort(chars);
+
+        selected = new char[l];
+
+        dfs(0, 0, 0, 0);
+
+        System.out.print(sb);
+    }
+
+    static void dfs(int idx, int depth, int vowel, int consonant) {
+        if (depth == l) {
+            if (vowel >= 1 && consonant >= 2) {
+                sb.append(selected).append('\n');
+            }
+            return;
+        }
+
+        if (idx == c) {
+            return;
+        }
+
+        char ch = chars[idx];
+        selected[depth] = ch;
+        if (isVowel(ch)) {
+            dfs(idx + 1, depth + 1, vowel+ 1, consonant);
+        } else {
+            dfs(idx + 1, depth + 1, vowel, consonant + 1);
+        }
+
+        dfs(idx + 1, depth, vowel, consonant);
+    }
+
+    static boolean isVowel(char c) {
+        return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
+    }
+}
+```