[20251229] BOJ / G3 / 택배 / 김민진

Author: zinnnn37

zinnnn37/202512/29 BOJ G3 택배.md

@@ -0,0 +1,85 @@
+```java
+import java.io.*;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class BJ_1719_택배 {
+
+    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 final StringBuilder   sb = new StringBuilder();
+    private static       StringTokenizer st;
+
+    private static int N, M;
+    private static int[][] dist, route;
+
+    private static class Node {
+        int to;
+        int weight;
+
+        Node(int to, int weight) {
+            this.to = to;
+            this.weight = weight;
+        }
+
+    }
+
+    public static void main(String[] args) throws IOException {
+        init();
+        sol();
+    }
+
+    private static void init() throws IOException {
+        st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        dist = new int[N + 1][N + 1];
+        route = new int[N + 1][N + 1];
+        for (int i = 1; i <= N; i++) {
+            Arrays.fill(dist[i], INF);
+            dist[i][i] = 0;
+        }
+
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+            int c = Integer.parseInt(st.nextToken());
+
+            dist[a][b] = dist[b][a] = Math.min(dist[a][b], c);
+            route[a][b] = b;
+            route[b][a] = a;
+        }
+    }
+
+    private static void sol() throws IOException {
+        for (int k = 1; k <= N; k++) {
+            for (int i = 1; i <= N; i++) {
+                for (int j = 1; j <= N; j++) {
+                    if (dist[i][j] > dist[i][k] + dist[k][j]) {
+                        dist[i][j] = dist[i][k] + dist[k][j];
+                        route[i][j] = route[i][k];
+                    }
+                }
+            }
+        }
+
+        for (int i = 1; i <= N; i++) {
+            for (int j = 1; j <= N; j++) {
+                sb.append(i == j ? "-" : route[i][j]);
+                if (j < N) sb.append(" ");
+            }
+            sb.append("\n");
+        }
+        bw.write(sb.toString());
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+}
+```