From 6036a336b9998601e32467d41cdb86d557fe8d3b Mon Sep 17 00:00:00 2001
From: suyeun84 <81475092+suyeun84@users.noreply.github.com>
Date: Mon, 16 Jun 2025 17:27:58 +0900
Subject: [PATCH] =?UTF-8?q?[20250616]=20BOJ=20/=20G3=20/=20=EC=97=AD?=
 =?UTF-8?q?=EC=82=AC=20/=20=EA=B9=80=EC=88=98=EC=97=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../16 BOJ G3 \354\227\255\354\202\254.md"    | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 "suyeun84/202506/16 BOJ G3 \354\227\255\354\202\254.md"

diff --git "a/suyeun84/202506/16 BOJ G3 \354\227\255\354\202\254.md" "b/suyeun84/202506/16 BOJ G3 \354\227\255\354\202\254.md"
new file mode 100644
index 00000000..f250d31e
--- /dev/null
+++ "b/suyeun84/202506/16 BOJ G3 \354\227\255\354\202\254.md"	
@@ -0,0 +1,53 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj1613 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	
+	static int N;
+	static int[][] floyd;
+	static int INF = 100000000;
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		N = nextInt();
+		int K = nextInt();
+		floyd = new int[N+1][N+1];
+		for (int i = 0; i < N+1; i++) {
+			Arrays.fill(floyd[i], INF);
+			floyd[i][i] = 0;
+		}
+		for (int i = 0; i < K; i++) {
+			nextLine();
+			int a = nextInt();
+			int b = nextInt();
+			floyd[a][b] = 1;
+		}
+		solve();
+		nextLine();
+		int S = nextInt();
+		for (int i = 0; i < S; i++) {
+			nextLine();
+			int a = nextInt();
+			int b = nextInt();
+			if (floyd[a][b] != INF) System.out.println(-1);
+			else if (floyd[b][a] != INF) System.out.println(1);
+			else System.out.println(0);
+		}
+	}
+	
+	static void solve() {
+		for (int k = 1; k <= N; k++) {
+			for (int i = 1; i <= N; i++) {
+				for (int j = 1; j <= N; j++) {
+					if (floyd[i][k] == INF || floyd[k][j] == INF) continue;
+					floyd[i][j] = Math.min(floyd[i][j], floyd[i][k]+floyd[k][j]);
+				}
+			}
+		}
+	}
+}
+```