diff --git "a/LiiNi-coder/202508/29 BOJ \355\203\235\353\260\260 \353\260\260\354\206\241.md" "b/LiiNi-coder/202508/29 BOJ \355\203\235\353\260\260 \353\260\260\354\206\241.md" new file mode 100644 index 00000000..6626977c --- /dev/null +++ "b/LiiNi-coder/202508/29 BOJ \355\203\235\353\260\260 \353\260\260\354\206\241.md" @@ -0,0 +1,80 @@ +```java +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStreamReader; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import java.util.PriorityQueue; +import java.util.StringTokenizer; + +public class Main { + private static BufferedReader br; + private static int n; + private static int m; + private static List[] graph; + private static int[] dist; + + private static class Node implements Comparable { + int v; + int w; + + public Node(int v, int w) { + this.v = v; + this.w = w; + } + + @Override + public int compareTo(Node other) { + return this.w - other.w; + } + } + + public static void main(String[] args) throws IOException { + br = new BufferedReader(new InputStreamReader(System.in)); + StringTokenizer st = new StringTokenizer(br.readLine()); + n = Integer.parseInt(st.nextToken()); + m = Integer.parseInt(st.nextToken()); + graph = new ArrayList[n + 1]; + for (int i = 1; i <= n; i++) { + graph[i] = new ArrayList<>(); + } + 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()); + + graph[a].add(new Node(b, c)); + graph[b].add(new Node(a, c)); + } + + dist = new int[n + 1]; + Arrays.fill(dist, Integer.MAX_VALUE); + + dijkstra(1); + + System.out.println(dist[n]); + } + + private static void dijkstra(int start) { + PriorityQueue pq = new PriorityQueue<>(); + dist[start] = 0; + pq.add(new Node(start, 0)); + + while (!pq.isEmpty()) { + Node now = pq.poll(); + + if (dist[now.v] < now.w) continue; + + for (Node next : graph[now.v]) { + if (dist[next.v] > dist[now.v] + next.w) { + dist[next.v] = dist[now.v] + next.w; + pq.add(new Node(next.v, dist[next.v])); + } + } + } + } +} + +```