[20251023] BOJ / G4 / 가르침 / 김민진

Author: zinnnn37

zinnnn37/202510/23 BOJ G4 가르침.md

@@ -0,0 +1,91 @@
+```java
+import java.io.*;
+import java.util.StringTokenizer;
+
+public class BJ_1062_가르침 {
+
+	private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+	private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	private static       StringTokenizer st;
+
+	private static int N, K, ans;
+	private static String[]  words;
+	private static boolean[] alpha;
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol(0, 0);
+		print(ans);
+	}
+
+	private static void init() throws IOException {
+		st = new StringTokenizer(br.readLine());
+		N = Integer.parseInt(st.nextToken());
+		K = Integer.parseInt(st.nextToken());
+		ans = 0;
+
+		words = new String[N];
+		for (int i = 0; i < N; i++) {
+			words[i] = br.readLine();
+
+			words[i] = words[i].replace("anta", "");
+			words[i] = words[i].replace("tica", "");
+		}
+
+		if (K < 5) {
+			print(0);
+			System.exit(0);
+		} else if (K >= 26) {
+			print(N);
+			System.exit(0);
+		}
+		K -= 5;
+
+		alpha = new boolean[26];
+		alpha[0] = true;
+		alpha['n' - 'a'] = true;
+		alpha['t' - 'a'] = true;
+		alpha['i' - 'a'] = true;
+		alpha['c' - 'a'] = true;
+	}
+
+	private static void sol(int depth, int start) {
+		if (depth == K) {
+			countAlpha();
+			return;
+		}
+
+		for (int i = start; i < 26; i++) {
+			if (alpha[i]) continue;
+
+			alpha[i] = true;
+			sol(depth + 1, i);
+			alpha[i] = false;
+		}
+	}
+
+	private static void countAlpha() {
+		int     cnt = 0;
+		boolean flag;
+		for (String word : words) {
+			flag = true;
+			for (int i = 0; i < word.length(); i++) {
+				if (!alpha[word.charAt(i) - 'a']) {
+					flag = false;
+					break;
+				}
+			}
+			cnt += flag ? 1 : 0;
+		}
+		ans = Math.max(ans, cnt);
+	}
+
+	private static void print(int i) throws IOException {
+		bw.write(i + "");
+		bw.flush();
+		bw.close();
+		br.close();
+	}
+
+}
+```