結果
| 問題 | No.2522 Fall in love, Girls! |
| コンテスト | |
| ユーザー |
Kude
|
| 提出日時 | 2023-10-27 23:42:19 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.89.0) |
| 結果 |
AC
|
| 実行時間 | 107 ms / 2,000 ms |
| コード長 | 2,967 bytes |
| 記録 | |
| コンパイル時間 | 3,795 ms |
| コンパイル使用メモリ | 281,708 KB |
| 実行使用メモリ | 15,192 KB |
| 最終ジャッジ日時 | 2024-09-25 15:32:06 |
| 合計ジャッジ時間 | 5,713 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 30 |
コンパイルメッセージ
main.cpp:49:6: warning: '{anonymous}::mint {anonymous}::perm(int, int)' defined but not used [-Wunused-function]
49 | mint perm(int n, int k) {
| ^~~~
main.cpp:48:6: warning: '{anonymous}::mint {anonymous}::fact(int)' defined but not used [-Wunused-function]
48 | mint fact(int n) {return Fact[n];}
| ^~~~
main.cpp:44:6: warning: '{anonymous}::mint {anonymous}::icomb(int, int)' defined but not used [-Wunused-function]
44 | mint icomb(int n, int k) {
| ^~~~~
ソースコード
#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;
constexpr int FACT_SIZE = 1000000;
mint Fact[FACT_SIZE + 1];
mint iFact[FACT_SIZE + 1];
const auto fact_init = [] {
Fact[0] = mint::raw(1);
for(int i = 1; i <= FACT_SIZE; ++i) {
Fact[i] = Fact[i-1] * i;
}
iFact[FACT_SIZE] = Fact[FACT_SIZE].inv();
for(int i = FACT_SIZE; i; --i) {
iFact[i-1] = iFact[i] * i;
}
return false;
}();
mint comb(int n, int k) {
if (k == 0) return mint::raw(1);
assert(n >= 0 && k >= 0);
if (k > n) return mint::raw(0);
return Fact[n] * iFact[n - k] * iFact[k];
}
mint icomb(int n, int k) {
return iFact[n] * Fact[n - k] * Fact[k];
}
mint fact(int n) {return Fact[n];}
mint perm(int n, int k) {
assert(0 <= n);
return Fact[n] * iFact[n - k];
}
template <class S>
struct value_compression : vector<S> {
bool built = false;
using VS = vector<S>;
using VS::VS;
value_compression(vector<S> v) : vector<S>(move(v)) {}
void build() {
sort(this->begin(), this->end());
this->erase(unique(this->begin(), this->end()), this->end());
built = true;
}
template <class T>
void convert(T first, T last) {
assert(built);
for (; first != last; ++first) *first = (*this)(*first);
}
int operator()(S x) {
assert(built);
return lower_bound(this->begin(), this->end(), x) - this->begin();
}
void clear() {
this->clear();
built = false;
}
};
} int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, m, k;
cin >> n >> m >> k;
vector<P> xy(k);
value_compression<int> vc;
for(auto& [x, y] : xy) cin >> x >> y, vc.emplace_back(x), vc.emplace_back(y);
vc.build();
for(auto& [x, y] : xy) x = vc(x), y = vc(y);
int other_mains = n - m;
for (int x : vc) other_mains -= x > m;
int sz = vc.size();
VI req(sz);
for(auto [x, y] : xy) req[y] |= 1 << x;
vector<mint> dp(1 << sz);
// cout << other_mains << endl;
if (other_mains) dp[0] = other_mains * Fact[n - 1 - sz] * comb(n - 1, sz);
rep(i, sz) if (vc[i] > m && !req[i]) dp[1 << i] = Fact[n - sz] * comb(n - 1, sz - 1);
rep(s, 1 << sz) {
rep(j, sz) if (!(s >> j & 1) && (req[j] & s) == req[j]) {
dp[s | 1 << j] += dp[s];
}
}
cout << dp.back().val() << '\n';
}
Kude