[20260202] BOJ / G4 / 운동 / 이강현

lkhyun/202602/02 BOJ G4 운동.md

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+```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);
+    }
+}
+```