[20250705] BOJ / G4 / 고냥이 / 김수연

suyeun84/202507/05 BOJ G4 고냥이.md

@@ -0,0 +1,25 @@
+```java
+import java.io.*;
+
+public class boj16472 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+	public static void main(String[] args) throws Exception {
+		int N = Integer.parseInt(br.readLine());
+		String input = br.readLine();
+		int[] alpha = new int[26];
+		int cnt = 0, answer = 0, start = 0, end = -1;
+
+		while (++end < input.length()) {
+            if (alpha[input.charAt(end) - 'a']++ == 0) cnt++;
+
+            while (N < cnt) {
+                if (--alpha[input.charAt(start++) - 'a'] == 0) cnt--;
+            }
+
+            answer = Math.max(answer, end - start + 1);
+        }
+        System.out.println(answer);
+	}
+}
+```