From 1c71096681fdb5fd1f635a82565e2a6d5a58f75f Mon Sep 17 00:00:00 2001
From: JHLEE325 <82587652+JHLEE325@users.noreply.github.com>
Date: Thu, 25 Sep 2025 08:29:09 +0900
Subject: [PATCH] =?UTF-8?q?[20250925]=20BOJ=20/=20G5=20/=20=EC=88=AB?=
 =?UTF-8?q?=EC=9E=90=EA=B3=A0=EB=A5=B4=EA=B8=B0=20/=20=EC=9D=B4=EC=A4=80?=
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---
 ...20\352\263\240\353\245\264\352\270\260.md" | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 "JHLEE325/202509/25 BOJ G5 \354\210\253\354\236\220\352\263\240\353\245\264\352\270\260.md"

diff --git "a/JHLEE325/202509/25 BOJ G5 \354\210\253\354\236\220\352\263\240\353\245\264\352\270\260.md" "b/JHLEE325/202509/25 BOJ G5 \354\210\253\354\236\220\352\263\240\353\245\264\352\270\260.md"
new file mode 100644
index 00000000..555acfc3
--- /dev/null
+++ "b/JHLEE325/202509/25 BOJ G5 \354\210\253\354\236\220\352\263\240\353\245\264\352\270\260.md"	
@@ -0,0 +1,44 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int n;
+    static int[] arr;
+    static boolean[] visited;
+    static Set<Integer> result = new TreeSet<>();
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        StringBuilder sb = new StringBuilder();
+
+        n = Integer.parseInt(br.readLine());
+
+        arr = new int[n +1];
+        for (int i = 1; i <= n; i++) {
+            arr[i] = Integer.parseInt(br.readLine());
+        }
+
+        for (int i = 1; i <= n; i++) {
+            visited = new boolean[n +1];
+            dfs(i, i);
+        }
+
+        sb.append(result.size()).append("\n");
+        for (int x : result) sb.append(x).append("\n");
+        System.out.print(sb);
+    }
+
+    static void dfs(int start, int cur) {
+        if (!visited[cur]) {
+            visited[cur] = true;
+            dfs(start, arr[cur]);
+        } else {
+            if (cur == start) {
+                result.add(cur);
+            }
+        }
+    }
+}
+```