[20250319] BOJ / G3 / 음악프로그램 / 김수연

Author: suyeun84

suyeun84/202503/19 BOJ G3 음악프로그램.md

@@ -0,0 +1,54 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj2623 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		int N = nextInt();
+		int M = nextInt();
+		int[] cnt = new int[N+1];
+		ArrayList<Integer> answer = new ArrayList<>();
+		ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
+		for (int i = 0; i < N+1; i++) graph.add(new ArrayList<>());
+		
+		for (int i = 0; i < M; i++) {
+			nextLine();
+			int num = nextInt();
+			int prev = nextInt();
+			for (int j = 0; j < num-1; j++) {
+				int curr = nextInt();
+				graph.get(prev).add(curr);
+				cnt[curr]++;
+				prev = curr;
+			}
+		}
+		while (answer.size() != N) {
+			boolean flag = true;
+			for (int i = 1; i < N+1; i++) {
+				if (cnt[i] == 0) {
+					cnt[i] = -1;
+					answer.add(i);
+					for (int next : graph.get(i)) {
+						cnt[next]--;
+					}
+					flag = false;
+				}
+			}
+			if (flag) {
+				System.out.println(0);
+				return;
+			}
+		}
+		for (int i = 0; i < N; i++) {
+			System.out.println(answer.get(i));
+		}
+	}
+}
+
+```