提出 #74221222

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ソースコード 拡げる

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        InputReader reader = new InputReader(System.in);
        PrintWriter writer = new PrintWriter(System.out, false);
        int N = reader.nextInt();
        int M = reader.nextInt();
        int[] inDegree = new int[N];
        List<List<Integer>> graph = new ArrayList<>(N);
        for (int i = 0; i < N; i++) {
            graph.add(new ArrayList<>());
        }
        for (int i = 0; i < M; i++) {
            int a = reader.nextInt() - 1;
            int b = reader.nextInt() - 1;
            graph.get(a).add(b);
            inDegree[b]++;
        }
        PriorityQueue<Integer> heap = new PriorityQueue<>();
        for (int i = 0; i < N; i++) {
            if (inDegree[i] == 0) heap.offer(i);
        }
        while (!heap.isEmpty()) {
            int u = heap.poll();
            writer.print(u + 1 + " ");
            for (int v : graph.get(u)) {
                if (--inDegree[v] == 0) heap.offer(v);
            }
        }
        writer.close();
        System.exit(0);
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
            return Long.parseLong(next());
        }
        public double nextDouble() {
            return Double.parseDouble(next());
        }
        public String nextLine() {
            String str = "";
            try {
                str = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}

提出情報

ジャッジ結果