結果

問題 No.3071 Double Speedrun
ユーザー 👑 Nachia
提出日時 2025-03-21 22:12:30
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 274 ms / 6,000 ms
コード長 4,105 bytes
コンパイル時間 873 ms
コンパイル使用メモリ 84,024 KB
実行使用メモリ 7,324 KB
最終ジャッジ日時 2025-03-21 22:12:35
合計ジャッジ時間 4,259 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
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 * 14
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 #
プレゼンテーションモードにする

#ifdef NACHIA
#define _GLIBCXX_DEBUG
#else
#define NDEBUG
#endif
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(i64 i=0; i<i64(n); i++)
const i64 INF = 1001001001001001001;
template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }
template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }
using namespace std;
#include <utility>
#include <cassert>
namespace nachia{
// ax + by = gcd(a,b)
// return ( x, - )
std::pair<long long, long long> ExtGcd(long long a, long long b){
long long x = 1, y = 0;
while(b){
long long u = a / b;
std::swap(a-=b*u, b);
std::swap(x-=y*u, y);
}
return std::make_pair(x, a);
}
} // namespace nachia
namespace nachia{
template<unsigned int MOD>
struct StaticModint{
private:
using u64 = unsigned long long;
unsigned int x;
public:
using my_type = StaticModint;
template< class Elem >
static Elem safe_mod(Elem x){
if(x < 0){
if(0 <= x+MOD) return x + MOD;
return MOD - ((-(x+MOD)-1) % MOD + 1);
}
return x % MOD;
}
StaticModint() : x(0){}
StaticModint(const my_type& a) : x(a.x){}
StaticModint& operator=(const my_type&) = default;
template< class Elem >
StaticModint(Elem v) : x(safe_mod(v)){}
unsigned int operator*() const { return x; }
my_type& operator+=(const my_type& r) { auto t = x + r.x; if(t >= MOD) t -= MOD; x = t; return *this; }
my_type operator+(const my_type& r) const { my_type res = *this; return res += r; }
my_type& operator-=(const my_type& r) { auto t = x + MOD - r.x; if(t >= MOD) t -= MOD; x = t; return *this; }
my_type operator-(const my_type& r) const { my_type res = *this; return res -= r; }
my_type operator-() const noexcept { my_type res = *this; res.x = ((res.x == 0) ? 0 : (MOD - res.x)); return res; }
my_type& operator*=(const my_type& r){ x = (u64)x * r.x % MOD; return *this; }
my_type operator*(const my_type& r) const { my_type res = *this; return res *= r; }
bool operator==(const my_type& r) const { return x == r.x; }
my_type pow(unsigned long long i) const {
my_type a = *this, res = 1;
while(i){ if(i & 1){ res *= a; } a *= a; i >>= 1; }
return res;
}
my_type inv() const { return my_type(ExtGcd(x, MOD).first); }
unsigned int val() const { return x; }
int hval() const { return int(x > MOD/2 ? x - MOD : x); }
static constexpr unsigned int mod() { return MOD; }
static my_type raw(unsigned int val) { auto res = my_type(); res.x = val; return res; }
my_type& operator/=(const my_type& r){ return operator*=(r.inv()); }
my_type operator/(const my_type& r) const { return operator*(r.inv()); }
};
} // namespace nachia
using Modint = nachia::StaticModint<998244353>;
void testcase(){
i64 H, W; cin >> H >> W;
vector<string> A(H+1);
rep(i,H) cin >> A[i];
rep(i,H) A[i].push_back('#');
A[H] = string(W+1, '#');
vector<vector<Modint>> dp(1, vector<Modint>(1,1));
for(i64 i=1; i<H+W-2; i++){
i64 p = dp.size();
vector<vector<Modint>> nx(p+1, vector<Modint>(p+1,0));
rep(a,p) rep(b,p) if(a<=b){
nx[a][b] += dp[a][b];
nx[a+1][b] += dp[a][b];
nx[a][b+1] += dp[a][b];
nx[a+1][b+1] += dp[a][b];
}
string ref;
for(i64 x=0; x<W; x++) if(0 <= i-x && i-x < H) ref.push_back(A[i-x][x]);
i64 q = ref.size();
//cout << ref << endl;
i64 off = i < H ? 0 : 1;
vector<vector<Modint>> nx2(q, vector<Modint>(q,0));
rep(a,q) rep(b,q) if(a<b && ref[a] == '.' && ref[b] == '.'){
nx2[a][b] = nx[a+off][b+off];
}
swap(dp, nx2);
//for(auto a : dp){
// for(auto b : a) cout << b.val() << " ";
// cout << endl;
//}
}
cout << dp[0][1].val() << "\n";
}
int main(){
ios::sync_with_stdio(false); cin.tie(nullptr);
rep(f,1) testcase();
return 0;
}
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