diff --git "a/Ukj0ng/202508/30 BOJ P5 \353\217\204\353\241\234\355\217\254\354\236\245.md" "b/Ukj0ng/202508/30 BOJ P5 \353\217\204\353\241\234\355\217\254\354\236\245.md" new file mode 100644 index 00000000..77aeff8d --- /dev/null +++ "b/Ukj0ng/202508/30 BOJ P5 \353\217\204\353\241\234\355\217\254\354\236\245.md" @@ -0,0 +1,95 @@ +``` +import java.io.*; +import java.util.*; + +public class Main { + 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 long INF = (long) 5e10 + 10; + private static List[] graph; + private static long[][] dist; + private static int N, M, K; + + public static void main(String[] args) throws IOException { + init(); + dijkstra(1); + long answer = INF; + for (int i = 0; i <= K; i++) { + answer = Math.min(answer, dist[N][i]); + } + bw.write(answer + "\n"); + bw.flush(); + bw.close(); + br.close(); + } + + private static void init() throws IOException { + StringTokenizer st = new StringTokenizer(br.readLine()); + N = Integer.parseInt(st.nextToken()); + M = Integer.parseInt(st.nextToken()); + K = Integer.parseInt(st.nextToken()); + + graph = new List[N+1]; + dist = new long[N+1][K+1]; + + for (int i = 1; i <= N; i++) { + graph[i] = new ArrayList<>(); + } + + for (int i = 1; i <= M; i++) { + st = new StringTokenizer(br.readLine()); + int start = Integer.parseInt(st.nextToken()); + int end = Integer.parseInt(st.nextToken()); + int cost = Integer.parseInt(st.nextToken()); + + graph[start].add(new Node(end, cost)); + graph[end].add(new Node(start, cost)); + } + } + + private static void dijkstra(int start) { + PriorityQueue pq = new PriorityQueue<>((o1, o2) -> Long.compare(o1.cost, o2.cost)); + for (int i = 1; i <= N; i++) { + Arrays.fill(dist[i], INF); + } + dist[start][0] = 0; + pq.add(new Node(start, dist[start][0], 0)); + + while (!pq.isEmpty()) { + Node current = pq.poll(); + + if (current.cost > dist[current.dest][current.pavement]) continue; + + for (Node next : graph[current.dest]) { + if (current.pavement+1 <= K && dist[current.dest][current.pavement]< dist[next.dest][current.pavement+1]) { + dist[next.dest][current.pavement+1] = dist[current.dest][current.pavement]; + pq.add(new Node(next.dest, dist[next.dest][current.pavement+1], current.pavement+1)); + } + + if (dist[current.dest][current.pavement] + next.cost < dist[next.dest][current.pavement]) { + dist[next.dest][current.pavement] = dist[current.dest][current.pavement] + next.cost; + pq.add(new Node(next.dest, dist[next.dest][current.pavement], current.pavement)); + } + } + } + } + + static class Node { + int dest; + long cost; + int pavement; + + Node (int dest, long cost) { + this.dest = dest; + this.cost = cost; + this.pavement = 0; + } + + Node (int dest, long cost, int pavement) { + this.dest = dest; + this.cost = cost; + this.pavement = pavement; + } + } +} +```