提出 #74221489

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ソースコード 拡げる

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

public class Main {
    private static final int MOD = 1000000007;
    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[] A = new int[N];
        for (int i = 0; i < N; i++) {
            A[i] = reader.nextInt();
        }
        int[] B = new int[M];
        for (int i = 0; i < M; i++) {
            B[i] = reader.nextInt();
        }
        long[][] dp = new long[N + 1][M + 1];
        for (int i = 0; i <= N; i++) dp[i][0] = 1;
        for (int i = 1; i <= N; i++) {
            for (int j = 1; j <= M; j++) {
                dp[i][j] = dp[i - 1][j];
                if (A[i - 1] == B[j - 1]) {
                    dp[i][j] = (dp[i][j] + dp[i - 1][j - 1]) % MOD;
                }
            }
        }
        writer.println(dp[N][M]);
        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