From 2a3d87599c74aadbece080cfa7eec1a80456ab5e Mon Sep 17 00:00:00 2001
From: Jonghwan Lee <123362165+0224LJH@users.noreply.github.com>
Date: Tue, 23 Sep 2025 18:47:59 +0900
Subject: [PATCH] =?UTF-8?q?[20250923]=20BOJ=20/=20G5=20/=20=EC=84=A0?=
 =?UTF-8?q?=EC=88=98=EA=B3=BC=EB=AA=A9=20/=20=EC=9D=B4=EC=A2=85=ED=99=98?=
MIME-Version: 1.0
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---
 ...40\354\210\230\352\263\274\353\252\251.md" | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 "0224LJH/202509/23 BOJ \354\204\240\354\210\230\352\263\274\353\252\251.md"

diff --git "a/0224LJH/202509/23 BOJ \354\204\240\354\210\230\352\263\274\353\252\251.md" "b/0224LJH/202509/23 BOJ \354\204\240\354\210\230\352\263\274\353\252\251.md"
new file mode 100644
index 00000000..0e468190
--- /dev/null
+++ "b/0224LJH/202509/23 BOJ \354\204\240\354\210\230\352\263\274\353\252\251.md"	
@@ -0,0 +1,92 @@
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class Main {
+	
+	static int nodeCnt, preCnt,ans;
+	static Node[] nodes;;
+	static StringBuilder sb = new StringBuilder();
+	
+	
+	static class Node{
+		int semester;
+		int num;
+		int parentCnt;
+		HashSet<Node> children;
+		
+		public Node(int num) {
+			semester = 1;
+			parentCnt = 0;
+			this.num = num;
+			children = new HashSet<>();
+			
+		}
+	}
+
+    public static void main(String[] args) throws NumberFormatException, IOException {
+    	init();
+    	process();
+    	print();
+    	
+
+    }
+    
+    public static void init() throws NumberFormatException, IOException {
+    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    	StringTokenizer st = new StringTokenizer(br.readLine());
+    	nodeCnt = Integer.parseInt(st.nextToken());
+    	preCnt = Integer.parseInt(st.nextToken());
+    	nodes = new Node[nodeCnt+1];
+    	for (int i = 1; i <= nodeCnt; i++) {
+    		nodes[i] = new Node(i);
+    	}
+    	
+    	for (int i = 0; i < preCnt; i++) {
+    		st = new StringTokenizer(br.readLine());
+    		int parent = Integer.parseInt(st.nextToken());
+    		int child = Integer.parseInt(st.nextToken());
+    		
+    		nodes[parent].children.add(nodes[child]);
+    		nodes[child].parentCnt++;
+    		
+    	}
+
+    }
+    
+    public static void process() { 	
+    	Queue<Node> pq = new LinkedList<>();
+    	
+    	for (int i = 1; i <= nodeCnt; i++ ) {
+    		
+    		Node node = nodes[i];
+    		if (node.parentCnt ==0) pq.add(node);
+    			
+    	}
+    	
+    	while (!pq.isEmpty()) {
+    		Node node = pq.poll();
+    		for (Node n: node.children ) {
+    			n.parentCnt--;
+    			if (n.parentCnt == 0) {
+    				n.semester = node.semester+1;
+    				pq.add(n);
+    			}
+    		}
+    	}
+
+    	
+    	for (int i = 1; i<= nodeCnt; i++) {
+    		sb.append(nodes[i].semester+ " ");
+    	}
+    }
+
+
+
+	public static void print() {
+		System.out.println(sb.toString());
+    }
+}
+```