結果
問題 | No.1554 array_and_me |
ユーザー | theory_and_me |
提出日時 | 2021-05-02 15:38:21 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 6,095 bytes |
コンパイル時間 | 2,544 ms |
コンパイル使用メモリ | 222,528 KB |
実行使用メモリ | 455,880 KB |
最終ジャッジ日時 | 2024-06-22 19:32:44 |
合計ジャッジ時間 | 71,689 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
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testcase_00 | AC | 1,552 ms
8,124 KB |
testcase_01 | WA | - |
testcase_02 | WA | - |
testcase_03 | WA | - |
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ソースコード
#include <bits/stdc++.h> using namespace std; #define REP(i,n) for(ll i=0;i<(ll)n;i++) #define dump(x) cerr << "Line " << __LINE__ << ": " << #x << " = " << (x) << "\n"; #define spa << " " << #define fi first #define se second #define ALL(a) (a).begin(),(a).end() #define ALLR(a) (a).rbegin(),(a).rend() using ld = long double; using ll = long long; using ull = unsigned long long; using pii = pair<int, int>; using pll = pair<ll, ll>; using pdd = pair<ld, ld>; template<typename T> using V = vector<T>; template<typename T> using P = pair<T, T>; template<typename T> vector<T> make_vec(size_t n, T a) { return vector<T>(n, a); } template<typename... Ts> auto make_vec(size_t n, Ts... ts) { return vector<decltype(make_vec(ts...))>(n, make_vec(ts...)); } template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){os << "(" << v.first << ", " << v.second << ")"; return os;} template<typename T> ostream& operator<<(ostream &os, const vector<T> &v) { for (auto &e : v) os << e << ' '; return os; } template<class T> ostream& operator<<(ostream& os, const vector<vector<T>> &v){ for(auto &e : v){os << e << "\n";} return os;} struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_; template <class T> void UNIQUE(vector<T> &x) {sort(ALL(x));x.erase(unique(ALL(x)), x.end());} template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; } template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; } void fail() { cout << -1 << '\n'; exit(0); } inline int popcount(const int x) { return __builtin_popcount(x); } inline int popcount(const ll x) { return __builtin_popcountll(x); } template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++) {cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<"\n";}}; template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0]; for(ll i=1;i<n;i++)cerr spa v[i]; cerr<<"\n";}; const ll INF = (1ll<<62); // const ld EPS = 1e-10; // const ld PI = acos(-1.0); // const ll mod = (int)1e9 + 7; const ll mod = 998244353; template <std::uint_fast64_t Modulus> class modint { // long long から modint を作るときは必ず正の数にしてからコンストラクタに入れること! // そうしないとバグります using u64 = std::uint_fast64_t; public: u64 a; constexpr modint(const u64 x = 0) noexcept : a(x % Modulus) {} constexpr u64 &value() noexcept { return a; } constexpr const u64 &value() const noexcept { return a; } constexpr modint operator+(const modint rhs) const noexcept { return modint(*this) += rhs; } constexpr modint operator-(const modint rhs) const noexcept { return modint(*this) -= rhs; } constexpr modint operator*(const modint rhs) const noexcept { return modint(*this) *= rhs; } constexpr modint operator/(const modint rhs) const noexcept { return modint(*this) /= rhs; } constexpr modint &operator+=(const modint rhs) noexcept { a += rhs.a; if (a >= Modulus) { a -= Modulus; } return *this; } constexpr modint &operator-=(const modint rhs) noexcept { if (a < rhs.a) { a += Modulus; } a -= rhs.a; return *this; } constexpr modint &operator*=(const modint rhs) noexcept { a = a * rhs.a % Modulus; return *this; } constexpr modint &operator/=(modint rhs) noexcept { u64 exp = Modulus - 2; while (exp) { if (exp % 2) { *this *= rhs; } rhs *= rhs; exp /= 2; } return *this; } }; using mint = modint<mod>; using vm = vector<mint>; using vvm = vector<vm>; ostream& operator << (ostream& os, const mint v){ os << v.value(); return os; } template <class T, class U> constexpr T power(T x, U exp) { T ret = static_cast<T>(1); while (exp) { if (exp % static_cast<U>(2) == static_cast<U>(1)) ret *= x; exp /= static_cast<U>(2); x *= x; } return ::std::move(ret); } const int n_max = 300000; std::vector<mint> fact(n_max); std::vector<mint> fact_inv(n_max); mint calculate_objective_mod(vector<int> &x, vector<int> &A, int K){ int N = A.size(); int A_sum = 0; for(int i=0;i<N;i++) A_sum += A[i]; mint A_sum_inv = mint(1)/A_sum; mint res = 1; // for(int i=1;i<=K;i++) res *= i; // for(int i=0;i<N;i++){ // for(int j=1;j<=x[i];j++) res /= j; // } res *= fact[K]; for(int i=0;i<N;i++){ res *= fact_inv[x[i]]; } for(int i=0;i<N;i++){ mint y = A[i]; y *= A_sum_inv; res *= power(y, x[i]); } return res; } random_device seed_gen; mt19937 engine(seed_gen()); void solve(double test_time_limit){ int N, K; cin >> N >> K; vector<int> A(N); for(int i=0;i<N;i++) cin >> A[i]; clock_t start_time = clock(); map<vector<int>, ll> mp; ll cnt_max = 0; mint res = 0; while(true){ clock_t current_time = clock(); // dump((double)(current_time - start_time) / CLOCKS_PER_SEC) if((double)(current_time - start_time) / CLOCKS_PER_SEC > test_time_limit) break; vector<double> probabilities(N); for(int i=0;i<N;i++) probabilities[i] = A[i]; discrete_distribution<> dist(probabilities.begin(), probabilities.end()); vector<int> x(N, 0); for(int t=0;t<K;t++){ int idx = dist(engine); x[idx]++; } mp[x]++; if(mp[x] > cnt_max){ cnt_max = mp[x]; res = calculate_objective_mod(x, A, K); } } // for(auto x: mp){ // cerr << x.first << ": " << x.second << "\n"; // } cout << res << endl; return; } int main(){ int T; cin >> T; double TIME_LIMIT = 1.50; double test_time_limit = TIME_LIMIT/T; // 階乗前計算 fact[0] = 1; fact_inv[0] = 1; for (int i = 1; i < n_max; ++i) { fact[i] = fact[i - 1] * i; fact_inv[i] = mint(1)/fact[i]; } while(T--){ solve(test_time_limit); } }