結果
| 問題 |
No.3071 Double Speedrun
|
| コンテスト | |
| 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 |
(要ログイン)
| 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, 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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