From 042258ead38235c547832ee40b5b30d1886c3c4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EA=B9=80=EB=AF=BC=EC=A7=84?= <zinnnn37@gmail.com>
Date: Thu, 28 Aug 2025 14:28:31 +0900
Subject: [PATCH] =?UTF-8?q?[20250828]=20BOJ=20/=20G3=20/=20=EC=A4=84=20?=
 =?UTF-8?q?=EC=84=B8=EC=9A=B0=EA=B8=B0=20/=20=EA=B9=80=EB=AF=BC=EC=A7=84?=
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---
 ...4 \354\204\270\354\232\260\352\270\260.md" | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 "zinnnn37/202508/28 BOJ G3 \354\244\204 \354\204\270\354\232\260\352\270\260.md"

diff --git "a/zinnnn37/202508/28 BOJ G3 \354\244\204 \354\204\270\354\232\260\352\270\260.md" "b/zinnnn37/202508/28 BOJ G3 \354\244\204 \354\204\270\354\232\260\352\270\260.md"
new file mode 100644
index 00000000..c4486378
--- /dev/null
+++ "b/zinnnn37/202508/28 BOJ G3 \354\244\204 \354\204\270\354\232\260\352\270\260.md"	
@@ -0,0 +1,83 @@
+```java
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Queue;
+import java.util.StringTokenizer;
+
+public class BJ_2252_줄_세우기 {
+
+    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;
+    private static int M;
+
+    private static int[] inDegree;
+    private static List<Integer>[] graph;
+    private static Queue<Integer> q;
+
+    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());
+
+        inDegree = new int[N + 1];
+        graph = new ArrayList[N + 1];
+        for (int i = 1; i <= N; i++) {
+            graph[i] = new ArrayList<>();
+        }
+
+        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 ArrayDeque<>();
+    }
+
+    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 i : graph[cur]) {
+                inDegree[i]--;
+
+                if (inDegree[i] == 0) {
+                    q.offer(i);
+                }
+            }
+        }
+
+        bw.write(sb.toString());
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+}
+```
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