結果
| 問題 |
No.3071 Double Speedrun
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2025-03-21 22:48:34 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,030 ms / 6,000 ms |
| コード長 | 3,260 bytes |
| コンパイル時間 | 1,749 ms |
| コンパイル使用メモリ | 169,464 KB |
| 実行使用メモリ | 7,324 KB |
| 最終ジャッジ日時 | 2025-03-21 22:48:46 |
| 合計ジャッジ時間 | 10,783 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge6 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 14 |
ソースコード
#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,s,n) for (int i = (s); i < (n); ++i)
#define rrep(i,n,g) for (int i = (n)-1; i >= (g); --i)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define len(x) (int)(x).size()
#define dup(x,y) (((x)+(y)-1)/(y))
#define pb push_back
#define eb emplace_back
#define Field(T) vector<vector<T>>
#define pq(T) priority_queue<T, vector<T>, greater<T>>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
template<class T>bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T&a,T b){if(b<a){a=b;return 1;}return 0;}
template< int mod >
struct ModInt {
int x;
ModInt() : x(0) {}
ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
ModInt &operator+=(const ModInt &p) {
if((x += p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator-=(const ModInt &p) {
if((x += mod - p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator*=(const ModInt &p) {
x = (int) (1LL * x * p.x % mod);
return *this;
}
ModInt &operator/=(const ModInt &p) {
*this *= p.inverse();
return *this;
}
ModInt operator-() const { return ModInt(-x); }
ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }
ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }
ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }
ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }
bool operator==(const ModInt &p) const { return x == p.x; }
bool operator!=(const ModInt &p) const { return x != p.x; }
ModInt inverse() const {
assert(x);
int a = x, b = mod, u = 1, v = 0, t;
while(b > 0) {
t = a / b;
swap(a -= t * b, b);
swap(u -= t * v, v);
}
return ModInt(u);
}
ModInt pow(int64_t n) const {
ModInt ret(1), mul(x);
while(n > 0) {
if(n & 1) ret *= mul;
mul *= mul;
n >>= 1;
}
return ret;
}
friend ostream &operator<<(ostream &os, const ModInt &p) {
return os << p.x;
}
friend istream &operator>>(istream &is, ModInt &a) {
int64_t t;
is >> t;
a = ModInt< mod >(t);
return (is);
}
static int get_mod() { return mod; }
};
using mint = ModInt<998244353>;
int main() {
int h, w;
cin >> h >> w;
vector<string> s(h);
rep(i,0,h) cin >> s[i];
vector<vector<mint>> dp(w, vector<mint>(w)), ndp(w, vector<mint>(w));
dp[0][1] = 1;
rep(t,0,h+w-4) {
rep(i,0,w) fill(all(ndp[i]), 0);
rep(i,0,w-1) rep(j,i+1,w) {
int x = t+1-i, y = i, p = t+1-j, q = j;
if (x < 0 || x >= h || p < 0 || p >= h) continue;
rep(d,0,4) {
int nx = x+(d%2 == 0), ny = y+(d%2 == 1);
int np = p+(d/2 == 0), nq = q+(d/2 == 1);
if (nx < 0 || nx >= h || ny < 0 || ny >= w || np < 0 || np >= h || nq < 0 || nq >= w) continue;
if (ny == nq || s[nx][ny] == '#' || s[np][nq] == '#') continue;
ndp[ny][nq] += dp[y][q];
}
}
// rep(i,0,w) {
// rep(j,0,w) {
// cout << ndp[i][j] << " ";
// }
// cout << endl;
// }
// cout << endl;
swap(dp, ndp);
}
cout << dp[w-2][w-1] << endl;
return 0;
}