[20250610] BOJ / G3 / ACM Craft / 이강현

Author: lkhyun

lkhyun/202506/10 BOJ G3 ACM Craft.md

@@ -0,0 +1,71 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N,K;
+    static int[] duration;
+    static List<Integer>[] adjList;
+    static int[] degree;
+    static int[] minTime;
+    static int goal;
+
+    public static void main(String[] args) throws IOException {
+        int T = Integer.parseInt(br.readLine());
+        for (int t = 1; t <= T; t++) {
+            st = new StringTokenizer(br.readLine());
+            N = Integer.parseInt(st.nextToken());
+            K = Integer.parseInt(st.nextToken());
+            duration = new int[N+1];
+            adjList = new List[N+1];
+            degree = new int[N+1];
+            minTime = new int[N+1];
+
+            st = new StringTokenizer(br.readLine());
+            for (int i = 1; i <= N; i++) {
+                duration[i] = Integer.parseInt(st.nextToken());
+                minTime[i] = duration[i];
+            }
+            for (int i = 1; i <= N; i++) {
+                adjList[i] = new ArrayList<>();
+            }
+            for (int i = 0; i < K; i++) {
+                st = new StringTokenizer(br.readLine());
+                int first = Integer.parseInt(st.nextToken());
+                int second = Integer.parseInt(st.nextToken());
+                adjList[first].add(second);
+                degree[second]++;
+            }
+            goal = Integer.parseInt(br.readLine());
+
+            go();
+        }
+
+        bw.close();
+    }
+    public static void go() throws IOException {
+        ArrayDeque<Integer> q = new ArrayDeque<>();
+        for (int i = 1; i <= N; i++) {
+            if(degree[i] == 0){
+                q.add(i);
+            }
+        }
+
+        while(!q.isEmpty()) {
+            int cur = q.poll();
+            for (int next : adjList[cur]) {
+                minTime[next] = Math.max(minTime[next], minTime[cur]+duration[next]);
+
+                degree[next]--;
+                if(degree[next] == 0){
+                    q.add(next);
+                }
+            }
+        }
+        bw.write(minTime[goal]+"\n");
+    }
+}
+```