結果
問題 | No.3071 Double Speedrun |
ユーザー |
👑 ![]() |
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 |
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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
#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 nachianamespace 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 nachiausing 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;}