結果
問題 |
No.3071 Double Speedrun
|
ユーザー |
![]() |
提出日時 | 2025-03-27 17:21:57 |
言語 | Java (openjdk 23) |
結果 |
MLE
|
実行時間 | - |
コード長 | 4,275 bytes |
コンパイル時間 | 2,607 ms |
コンパイル使用メモリ | 82,004 KB |
実行使用メモリ | 768,692 KB |
最終ジャッジ日時 | 2025-03-27 17:22:08 |
合計ジャッジ時間 | 11,210 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 1 MLE * 1 -- * 12 |
ソースコード
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, 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(0, new HashMap<>()); dp.get(0).put(1, new HashMap<>()); dp.get(0).get(1).put(1, new HashMap<>()); dp.get(0).get(1).get(1).put(0, 1); System.out.println(dfw(h - 2, w - 1, h - 1, w - 2)); } static int dfw(int a, int b, int c, int d) { if (a < 0 || b < 0 || c < 0 || d < 0 || (a == c && b == d) || field[a][b] == '#' || field[c][d] == '#') { return 0; } if (!dp.containsKey(a)) { dp.put(a, new HashMap<>()); } if (!dp.get(a).containsKey(b)) { dp.get(a).put(b, new HashMap<>()); } if (!dp.get(a).get(b).containsKey(c)) { dp.get(a).get(b).put(c, new HashMap<>()); } if (!dp.get(a).get(b).get(c).containsKey(d)) { int ans = dfw(a - 1, b, c - 1, d); ans += dfw(a - 1, b, c, d - 1); ans %= MOD; ans += dfw(a, b - 1, c, d - 1); ans %= MOD; ans += dfw(a, b - 1, c - 1, d); ans %= MOD; dp.get(a).get(b).get(c).put(d, ans); } return dp.get(a).get(b).get(c).get(d); } } 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); } } }