[20250810] BOJ / G5 / 택배 배송 / 이준희

Author: JHLEE325

JHLEE325/202508/10 BOJ G5 택배 배송.md

@@ -0,0 +1,76 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static int n, m;
+    static List<List<Node>> list = new ArrayList<>();
+
+    static class Node implements Comparable<Node> {
+        int dest, cost;
+
+        Node(int d, int c) {
+            this.dest = d;
+            this.cost = c;
+        }
+
+        @Override
+        public int compareTo(Node o) {
+            return this.cost - o.cost;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+
+        st = new StringTokenizer(br.readLine());
+
+        n = Integer.parseInt(st.nextToken());
+        m = Integer.parseInt(st.nextToken());
+
+        for (int i = 0; i < n + 1; i++) {
+            list.add(new ArrayList<>());
+        }
+
+        for (int i = 0; i < m; i++) {
+            st = new StringTokenizer(br.readLine());
+            int from = Integer.parseInt(st.nextToken());
+            int to = Integer.parseInt(st.nextToken());
+            int cost = Integer.parseInt(st.nextToken());
+
+            list.get(from).add(new Node(to, cost));
+            list.get(to).add(new Node(from, cost));
+        }
+
+        dijkstra(1, n);
+    }
+
+    static void dijkstra(int start, int end) {
+        int[] dist = new int[n + 1];
+        Arrays.fill(dist, 987654321);
+
+        PriorityQueue<Node> pq = new PriorityQueue<>();
+        dist[start] = 0;
+        pq.add(new Node(start, 0));
+
+        while (!pq.isEmpty()) {
+            Node cur = pq.poll();
+
+            if (dist[cur.dest] < cur.cost) continue;
+
+            for (Node next : list.get(cur.dest)) {
+                if (dist[next.dest] > dist[cur.dest] + next.cost) {
+                    dist[next.dest] = dist[cur.dest] + next.cost;
+                    pq.add(new Node(next.dest, dist[next.dest]));
+                }
+            }
+        }
+
+        System.out.println(dist[end]);
+    }
+
+}
+
+```