From 84aa8fda24d5a306860183ae4fd45c69dc9a2532 Mon Sep 17 00:00:00 2001
From: lkhyun <102892446+lkhyun@users.noreply.github.com>
Date: Mon, 2 Feb 2026 13:33:17 +0900
Subject: [PATCH] =?UTF-8?q?[20260202]=20BOJ=20/=20G4=20/=20=EC=9A=B4?=
 =?UTF-8?q?=EB=8F=99=20/=20=EC=9D=B4=EA=B0=95=ED=98=84?=
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---
 .../02 BOJ G4 \354\232\264\353\217\231.md"    | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 "lkhyun/202602/02 BOJ G4 \354\232\264\353\217\231.md"

diff --git "a/lkhyun/202602/02 BOJ G4 \354\232\264\353\217\231.md" "b/lkhyun/202602/02 BOJ G4 \354\232\264\353\217\231.md"
new file mode 100644
index 00000000..28789618
--- /dev/null
+++ "b/lkhyun/202602/02 BOJ G4 \354\232\264\353\217\231.md"	
@@ -0,0 +1,47 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static int V,E;
+    static int[][] matrix;
+    static int INF = 1000000007;
+    static int ans = INF;
+
+    public static void main(String[] args) throws Exception {
+        st = new StringTokenizer(br.readLine());
+        V = Integer.parseInt(st.nextToken());
+        E = Integer.parseInt(st.nextToken());
+
+        matrix = new int[V+1][V+1];
+        for (int i = 0; i <= V; i++) {
+            for (int j = 0; j <= V; j++) {
+                if(i != j) {
+                    matrix[i][j] = INF;
+                }
+            }
+        }
+
+        for (int i = 0; i < E; i++) {
+            st = new StringTokenizer(br.readLine());
+            int from = Integer.parseInt(st.nextToken());
+            int to = Integer.parseInt(st.nextToken());
+            int cost = Integer.parseInt(st.nextToken());
+            matrix[from][to] = cost;
+        }
+
+        for (int k = 1; k <= V; k++) for (int i = 1; i <= V; i++) for (int j = 1; j <= V; j++) {
+            matrix[i][j] = Math.min(matrix[i][j], matrix[i][k] + matrix[k][j]);
+        }
+
+        for (int i = 1; i <= V; i++) for (int j = 1; j <= V; j++) {
+            if(i != j) ans = Math.min(ans, matrix[i][j] + matrix[j][i]);
+        }
+
+        System.out.println(ans >= INF ? -1 : ans);
+    }
+}
+```