From ef76a9588304e05a703e81358ca227497cfa3460 Mon Sep 17 00:00:00 2001
From: zinnnn37 <zinnnn37@gmail.com>
Date: Thu, 9 Oct 2025 23:33:22 +0900
Subject: [PATCH] =?UTF-8?q?[20251009]=20BOJ=20/=20G2=20/=20=EB=AC=B8?=
 =?UTF-8?q?=EC=A0=9C=EC=A7=91=20/=20=EA=B9=80=EB=AF=BC=EC=A7=84?=
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---
 ...2 \353\254\270\354\240\234\354\247\221.md" | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 "zinnnn37/202510/9 BOJ G2 \353\254\270\354\240\234\354\247\221.md"

diff --git "a/zinnnn37/202510/9 BOJ G2 \353\254\270\354\240\234\354\247\221.md" "b/zinnnn37/202510/9 BOJ G2 \353\254\270\354\240\234\354\247\221.md"
new file mode 100644
index 00000000..4a05eb19
--- /dev/null
+++ "b/zinnnn37/202510/9 BOJ G2 \353\254\270\354\240\234\354\247\221.md"	
@@ -0,0 +1,74 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class BJ_1766_문제집 {
+
+	private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+	private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	private static final StringBuilder   sb = new StringBuilder();
+	private static       StringTokenizer st;
+
+	private static int N, M;
+	private static int[] inDegree;
+
+	private static Queue<Integer>  q;
+	private static List<Integer>[] graph;
+
+	public static void main(String[] args) throws IOException {
+		init();
+		sol();
+	}
+
+	private static void init() throws IOException {
+		st = new StringTokenizer(br.readLine());
+		N  = Integer.parseInt(st.nextToken());
+		M  = Integer.parseInt(st.nextToken());
+
+		graph = new ArrayList[N + 1];
+		for (int i = 1; i <= N; i++) {
+			graph[i] = new ArrayList<>();
+		}
+
+		inDegree = new int[N + 1];
+		for (int i = 0; i < M; i++) {
+			st = new StringTokenizer(br.readLine());
+
+			int u = Integer.parseInt(st.nextToken());
+			int v = Integer.parseInt(st.nextToken());
+
+			graph[u].add(v);
+			inDegree[v]++;
+		}
+
+		q = new PriorityQueue<>();
+	}
+
+	private static void sol() throws IOException {
+		for (int i = 1; i <= N; i++) {
+			if (inDegree[i] == 0) {
+				q.offer(i);
+			}
+		}
+
+		while (!q.isEmpty()) {
+			int cur = q.poll();
+
+			sb.append(cur).append(" ");
+
+			for (int v : graph[cur]) {
+				inDegree[v]--;
+				if (inDegree[v] == 0) {
+					q.offer(v);
+				}
+			}
+		}
+
+		bw.write(sb.toString());
+		bw.flush();
+		bw.close();
+		br.close();
+	}
+
+}
+```
\ No newline at end of file