結果

問題 No.3071 Double Speedrun
ユーザー tenten
提出日時 2025-03-27 17:35:22
言語 Java
(openjdk 23)
結果
MLE  
実行時間 -
コード長 4,099 bytes
コンパイル時間 4,708 ms
コンパイル使用メモリ 81,920 KB
実行使用メモリ 757,476 KB
最終ジャッジ日時 2025-03-27 17:35:36
合計ジャッジ時間 10,598 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 1 MLE * 1 -- * 12
権限があれば一括ダウンロードができます

ソースコード

diff # 

import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    static final int MOD = 998244353;
    static Map<Integer, Map<Integer, Map<Integer, Integer>>> dp = new HashMap<>();
    static char[][] field;
    public static void main(String[] args) throws Exception {
        FastScanner sc = new FastScanner();
        int h = sc.nextInt();
        int w = sc.nextInt();
        field = new char[h][];
        for (int i = 0; i < h; i++) {
            field[i] = sc.next().toCharArray();
        }
        dp.put(1, new HashMap<>());
        dp.get(1).put(0, new HashMap<>());
        dp.get(1).get(0).put(1, 1);
        System.out.println(dfw(h - 2 + w - 1, h - 2, h - 1));
    }
    
    static int dfw(int s, int a, int c) {
        int b = s - a;
        int d = s - c;
        if (a < 0 || b < 0 || c < 0 || d < 0 || (a == c && b == d) || field[a][b] == '#' || field[c][d] == '#') {
            return 0;
        }
        if (!dp.containsKey(s)) {
            dp.put(s, new HashMap<>());
        }
        if (!dp.get(s).containsKey(a)) {
            dp.get(s).put(a, new HashMap<>());
        }
        if (!dp.get(s).get(a).containsKey(c)) {
            int ans = dfw(s - 1, a, c);
            ans += dfw(s - 1, a - 1, c);
            ans %= MOD;
            ans += dfw(s - 1, a, c - 1);
            ans %= MOD;
            ans += dfw(s - 1, a - 1, c - 1);
            ans %= MOD;
            dp.get(s).get(a).put(c, ans);
        }
        return dp.get(s).get(a).get(c);
    }
}

class FastScanner {
    private DataInputStream din;
    private byte[] buffer;
    private int bufferPointer, bytesRead;
    private static final int BUFFER_SIZE = 1 << 16; // 65,536 バイト

    public FastScanner() {
        din = new DataInputStream(System.in);
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    private byte read() {
        try {
            if (bufferPointer == bytesRead) {
                bytesRead = din.read(buffer, 0, BUFFER_SIZE);
                if (bytesRead == -1) return -1;
                bufferPointer = 0;
            }
            return buffer[bufferPointer++];
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public String next() {
        byte b = read();
        // 空白文字を読み飛ばす
        while (isSpaceChar(b)) {
            b = read();
        }
        StringBuilder sb = new StringBuilder();
        while (!isSpaceChar(b)) {
            sb.append((char) b);
            b = read();
        }
        return sb.toString();
    }

    public int nextInt() {
        int ret = 0;
        byte c = read();
        while (isSpaceChar(c)) c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10 + c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return neg ? -ret : ret;
    }

    public long nextLong() {
        long ret = 0;
        byte c = read();
        while (isSpaceChar(c)) c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10L + c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return neg ? -ret : ret;
    }

    public double nextDouble() {
        double ret = 0, div = 1;
        byte c = read();
        while (isSpaceChar(c)) c = read();
        boolean neg = (c == '-');
        if (neg) c = read();
        do {
            ret = ret * 10 + c - '0';
            c = read();
        } while (!isSpaceChar(c) && c != '.');
        if (c == '.') {
            while (!isSpaceChar(c = read())) {
                ret += (c - '0') / (div *= 10);
            }
        }
        return neg ? -ret : ret;
    }

    private boolean isSpaceChar(byte c) {
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

    public void close() {
        try {
            if (din != null) din.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
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