[20251003] BOJ / G5 / MooTube (Silver) / 이준희

JHLEE325/202510/03 BOJ G5 MooTube (Silver).md

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+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static class Node {
+        int to, cost;
+        Node(int to, int cost) {
+            this.to = to;
+            this.cost = cost;
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        int N = Integer.parseInt(st.nextToken());
+        int Q = Integer.parseInt(st.nextToken());
+
+        List<Node>[] graph = new ArrayList[N + 1];
+        for (int i = 1; i <= N; i++) graph[i] = new ArrayList<>();
+
+        for (int i = 0; i < N - 1; i++) {
+            st = new StringTokenizer(br.readLine());
+            int p = Integer.parseInt(st.nextToken());
+            int q = Integer.parseInt(st.nextToken());
+            int r = Integer.parseInt(st.nextToken());
+            graph[p].add(new Node(q, r));
+            graph[q].add(new Node(p, r));
+        }
+
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < Q; i++) {
+            st = new StringTokenizer(br.readLine());
+            int k = Integer.parseInt(st.nextToken());
+            int v = Integer.parseInt(st.nextToken());
+
+            boolean[] visited = new boolean[N + 1];
+            Queue<Integer> q = new LinkedList<>();
+            visited[v] = true;
+            q.add(v);
+            int count = 0;
+
+            while (!q.isEmpty()) {
+                int cur = q.poll();
+                for (Node nxt : graph[cur]) {
+                    if (!visited[nxt.to] && nxt.cost >= k) {
+                        visited[nxt.to] = true;
+                        q.add(nxt.to);
+                        count++;
+                    }
+                }
+            }
+            sb.append(count).append("\n");
+        }
+
+        System.out.print(sb);
+    }
+}
+```