結果
| 問題 |
No.2023 Tiling is Fun
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-07-29 21:46:57 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 19 ms / 2,000 ms |
| コード長 | 3,311 bytes |
| コンパイル時間 | 1,766 ms |
| コンパイル使用メモリ | 175,024 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-07-19 14:16:39 |
| 合計ジャッジ時間 | 2,501 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 18 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define double long double
using ll = long long;
using VB = vector<bool>;
using VVB = vector<VB>;
using VVVB = vector<VVB>;
using VC = vector<char>;
using VI = vector<int>;
using VVI = vector<VI>;
using VVVI = vector<VVI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using VVVL = vector<VVL>;
using VVVVL = vector<VVVL>;
using VD = vector<double>;
using VVD = vector<VD>;
using VVVD = vector<VVD>;
//using P = pair<int, int>;
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define FOR(i, a, b) for (ll i = a; i < (ll)(b); i++)
#define ALL(a) (a).begin(),(a).end()
constexpr int INF = 1001001001;
constexpr ll LINF = 1001001001001001001ll;
constexpr int DX[] = {1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DY[] = {0, 1, 1, 1, 0, -1, -1, -1};
template< typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true); }
template< typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true); }
const ll MOD = 998244353;
const int MAX_N = 200010;
int par[MAX_N];
int rnk[MAX_N];
int siz[MAX_N];
void init(int n) {
REP(i,n) {
par[i] = i;
rnk[i] = 0;
siz[i] = 1;
}
}
int find(int x) {
if (par[x] == x) {
return x;
} else {
return par[x] = find(par[x]);
}
}
void unite(int x, int y) {
x = find(x);
y = find(y);
if (x == y) return;
int s = siz[x] + siz[y];
if (rnk[x] < rnk[y]) {
par[x] = y;
} else {
par[y] = x;
if (rnk[x] == rnk[y]) rnk[x]++;
}
siz[find(x)] = s;
}
bool same(int x, int y) {
return find(x) == find(y);
}
int size(int x) {
return siz[find(x)];
}
ll mod_pow(ll x, ll n, ll mod) {
ll res = 1;
while (n > 0) {
if (n & 1) res = res * x % mod;
x = x * x % mod;
n >>= 1;
}
return res;
}
ll gcd(ll x, ll y) {
if (y == 0) return x;
return gcd(y, x % y);
}
const int MAX_E = 5000, MAX_V = 2500;
struct edge { ll from, to, cost; };
edge es[MAX_E];
ll d[MAX_V];
int V, E;
void shortest_path(int s) {
for (int i = 0; i < V; i++) d[i] = LINF;
d[s] = 0;
REP(j, V) {
bool update = false;
for (int i = 0; i < E; i++) {
edge e = es[i];
if (d[e.from] != LINF && d[e.to] > d[e.from] + e.cost) {
d[e.to] = d[e.from] + e.cost;
update = true;
}
}
if (!update) break;
}
}
bool find_negative_loop() {
memset(d, 0, sizeof(d));
for (int i = 0; i < V; i++) {
for (int j = 0; j < E; j++) {
edge e = es[j];
if (d[e.to] > d[e.from] + e.cost) {
d[e.to] = d[e.from] + e.cost;
if (e.to == V - 1 && i == V - 1) return true;
}
}
}
return false;
}
map<ll, ll> mp;
ll f(ll X) {
if (mp.find(X) != mp.end()) return mp[X];
if (X < 5) {
mp[X] = X;
return X;
}
ll Y = X / 2, Z = X - Y;
mp[X] = f(Y) * f(Z) % MOD;
return mp[X];
}
int main() {
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
ll a, b, ans = 1;
cin >> a >> b;
REP(i, a - 1) ans = ans * (a + b - 2 - i) % MOD;
REP(i, a - 1) ans = ans * mod_pow(i + 1, MOD - 2, MOD) % MOD;
cout << ans << endl;
}