From 4735867a645e95805df655f5d485710b7dbccd1e Mon Sep 17 00:00:00 2001
From: JHLEE325 <82587652+JHLEE325@users.noreply.github.com>
Date: Wed, 29 Oct 2025 09:08:49 +0900
Subject: [PATCH] =?UTF-8?q?[20251029]=20BOJ=20/=20G1=20/=20=EC=B5=9C?=
 =?UTF-8?q?=EC=A2=85=20=EC=88=9C=EC=9C=84=20/=20=EC=9D=B4=EC=A4=80?=
 =?UTF-8?q?=ED=9D=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...4\354\242\205 \354\210\234\354\234\204.md" | 104 ++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 "JHLEE325/202510/29 BOJ G1 \354\265\234\354\242\205 \354\210\234\354\234\204.md"

diff --git "a/JHLEE325/202510/29 BOJ G1 \354\265\234\354\242\205 \354\210\234\354\234\204.md" "b/JHLEE325/202510/29 BOJ G1 \354\265\234\354\242\205 \354\210\234\354\234\204.md"
new file mode 100644
index 00000000..40413a42
--- /dev/null
+++ "b/JHLEE325/202510/29 BOJ G1 \354\265\234\354\242\205 \354\210\234\354\234\204.md"	
@@ -0,0 +1,104 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+
+        int T = Integer.parseInt(br.readLine().trim());
+        StringBuilder sb = new StringBuilder();
+
+        for (int t = 0; t < T; t++) {
+            int n = Integer.parseInt(br.readLine().trim());
+
+            st = new StringTokenizer(br.readLine());
+            int[] lastYear = new int[n];
+            for (int i = 0; i < n; i++) {
+                lastYear[i] = Integer.parseInt(st.nextToken());
+            }
+
+            boolean[][] graph = new boolean[n + 1][n + 1];
+            int[] indegree = new int[n + 1];
+
+            for (int i = 0; i < n; i++) {
+                for (int j = i + 1; j < n; j++) {
+                    int higher = lastYear[i];
+                    int lower = lastYear[j];
+                    if (!graph[higher][lower]) {
+                        graph[higher][lower] = true;
+                        indegree[lower]++;
+                    }
+                }
+            }
+
+            int m = Integer.parseInt(br.readLine().trim());
+            for (int i = 0; i < m; i++) {
+                st = new StringTokenizer(br.readLine());
+                int a = Integer.parseInt(st.nextToken());
+                int b = Integer.parseInt(st.nextToken());
+
+                if (graph[a][b]) {
+                    graph[a][b] = false;
+                    indegree[b]--;
+                    graph[b][a] = true;
+                    indegree[a]++;
+                } else if (graph[b][a]) {
+                    graph[b][a] = false;
+                    indegree[a]--;
+                    graph[a][b] = true;
+                    indegree[b]++;
+                } else {
+                    graph[a][b] = true;
+                    indegree[b]++;
+                }
+            }
+
+            Queue<Integer> q = new LinkedList<>();
+            for (int i = 1; i <= n; i++) {
+                if (indegree[i] == 0) {
+                    q.offer(i);
+                }
+            }
+
+            boolean ispossible = false;
+            List<Integer> result = new ArrayList<>();
+
+            for (int cnt = 0; cnt < n; cnt++) {
+                if (q.isEmpty()) {
+                    result = null;
+                    break;
+                }
+                if (q.size() > 1) {
+                    ispossible = true;
+                }
+                int cur = q.poll();
+                result.add(cur);
+
+                for (int next = 1; next <= n; next++) {
+                    if (graph[cur][next]) {
+                        indegree[next]--;
+                        if (indegree[next] == 0) {
+                            q.offer(next);
+                        }
+                    }
+                }
+            }
+
+            if (result == null) {
+                sb.append("IMPOSSIBLE\n");
+            } else if (ispossible) {
+                sb.append("?\n");
+            } else {
+                for (int x : result) {
+                    sb.append(x).append(" ");
+                }
+                sb.append("\n");
+            }
+        }
+
+        System.out.print(sb.toString());
+    }
+}
+```