[20250729] BOJ / G5 / 최소비용 구하기 / 설진영

Seol-JY/202507/29 BOJ G5 최소비용 구하기.md

@@ -0,0 +1,74 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {    
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int n = Integer.parseInt(br.readLine());
+        int m = Integer.parseInt(br.readLine());
+
+        ArrayDeque<Edge>[] graph = new ArrayDeque[n + 1];
+        for (int i = 1; i <= n; i++) {
+            graph[i] = new ArrayDeque<>();
+        }
+
+        for (int i = 0; i < m; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int from = Integer.parseInt(st.nextToken());
+            int to = Integer.parseInt(st.nextToken());
+            int cost = Integer.parseInt(st.nextToken());
+
+            graph[from].add(new Edge(to, cost));
+        }
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int start = Integer.parseInt(st.nextToken());
+        int end = Integer.parseInt(st.nextToken());
+
+        int[] dist = new int[n + 1];
+        Arrays.fill(dist, Integer.MAX_VALUE);
+        dist[start] = 0;
+
+        PriorityQueue<Edge> pq = new PriorityQueue<>();
+        pq.offer(new Edge(start, 0));
+
+        while (!pq.isEmpty()) {
+            Edge current = pq.poll();
+            int currentNode = current.to;
+            int currentCost = current.cost;
+
+            if (currentCost > dist[currentNode]) {
+                continue;
+            }
+
+            for (Edge next : graph[currentNode]) {
+                int nextNode = next.to;
+                int nextCost = currentCost + next.cost;
+
+                if (nextCost < dist[nextNode]) {
+                    dist[nextNode] = nextCost;
+                    pq.offer(new Edge(nextNode, nextCost));
+                }
+            }
+        }
+
+        System.out.println(dist[end]);
+    }
+
+        static class Edge implements Comparable<Edge> {
+        int to, cost;
+
+        public Edge(int to, int cost) {
+            this.to = to;
+            this.cost = cost;
+        }
+
+        @Override
+        public int compareTo(Edge o) {
+            return Integer.compare(this.cost, o.cost);
+        }
+    }
+}
+```