[20251217] BOJ / G4 / 운동 / 김민진

Author: zinnnn37

zinnnn37/202512/17 BOJ G4 운동.md

@@ -0,0 +1,66 @@
+```java
+import java.io.*;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class BJ_1956_운동 {
+
+    private static final int INF = 987654321;
+
+    private static final BufferedReader  br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static       StringTokenizer st;
+
+    private static int V, E, ans;
+    private static int[][] matrix;
+
+    public static void main(String[] args) throws IOException {
+        init();
+        sol();
+    }
+
+    private static void init() throws IOException {
+        st = new StringTokenizer(br.readLine());
+        V = Integer.parseInt(st.nextToken());
+        E = Integer.parseInt(st.nextToken());
+        ans = INF;
+
+        matrix = new int[V + 1][V + 1];
+        for (int i = 1; i <= V; i++) {
+            Arrays.fill(matrix[i], INF);
+        }
+
+        for (int i = 0; i < E; i++) {
+            st = new StringTokenizer(br.readLine());
+
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+            int w = Integer.parseInt(st.nextToken());
+
+            matrix[a][b] = w;
+        }
+
+    }
+
+    private static void sol() throws IOException {
+        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++) {
+            ans = Math.min(ans, matrix[i][i]);
+        }
+
+        bw.write(ans != INF ? ans + "" : "-1");
+
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+}
+```