結果
| 問題 | No.2058 Binary String |
| ユーザー |
 shotoyoo
|
| 提出日時 | 2022-08-26 21:49:51 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 40 ms / 2,000 ms |
| コード長 | 6,395 bytes |
| コンパイル時間 | 2,314 ms |
| コンパイル使用メモリ | 201,140 KB |
| 最終ジャッジ日時 | 2025-01-31 04:40:39 |
|
ジャッジサーバーID （参考情報） |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 23 |
ソースコード
bool TEST = false;using namespace std;#include<bits/stdc++.h>#include<fstream>#define rep(i,n) for(ll (i)=0;(i)<(ll)(n);i++)#define rrep(i,n) for(ll (i)=(ll)(n)-1;(i)>=0;i--)#define range(i,start,end,step) for(ll (i)=start;(i)<(ll)(end);(i)+=(step))#define rrange(i,start,end,step) for(ll (i)=start;(i)>(ll)(end);(i)+=(step))#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 VV = V<V<T>>;template<typename T, typename T2> using P = pair<T, T2>;template<typename T, typename T2> using M = map<T, T2>;template<typename T> using S = set<T>;template<typename T, typename T2> using UM = unordered_map<T, T2>;template<typename T> using PQ = priority_queue<T, V<T>, greater<T>>;template<typename T> using rPQ = priority_queue<T, V<T>, less<T>>;template<class T>vector<T> make_vec(size_t a){return vector<T>(a);}template<class T, class... Ts>auto make_vec(size_t a, Ts... ts){return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));}template<class SS, class T> ostream& operator << (ostream& os, const pair<SS, 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){for(ll i=0;i<v.size();i++){cerr<<v[i][0];for(ll j=1;j<v[i].size();j++)cerr spa v[i][j];cerr<<"\n";}};template<typename T> void debug(vector<T>&v){if(v.size()!=0)cerr<<v[0];for(ll i=1;i<v.size();i++)cerr spa v[i];cerr<<"\n";};template<typename T> void debug(priority_queue<T>&v){V<T> vals; while(!v.empty()) {cerr << v.top() << " "; vals.push_back(v.top()); v.pop();} cerr<<"\n"; for(auto val: vals) v.push(val);}template<typename T, typename T2> void debug(map<T,T2>&v){for(auto [k,v]: v) cerr << k spa v << "\n"; cerr<<"\n";}template<typename T, typename T2> void debug(unordered_map<T,T2>&v){for(auto [k,v]: v) cerr << k spa v << "\n";cerr<<"\n";}V<int> listrange(int n) {V<int> res(n); rep(i,n) res[i]=i; return res;}template<typename T> P<T,T> divmod(T a, T b) {return make_pair(a/b, a%b);}const ll INF = (1ll<<62);// const ld EPS = 1e-10;// const ld PI = acos(-1.0);template< int mod >struct ModInt {int x;ModInt() : x(0) {}ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}ModInt &operator+=(const ModInt &p) {if((x += p.x) >= mod) x -= mod;return *this;}ModInt &operator-=(const ModInt &p) {if((x += mod - p.x) >= mod) x -= mod;return *this;}ModInt &operator*=(const ModInt &p) {x = (int) (1LL * x * p.x % mod);return *this;}ModInt &operator/=(const ModInt &p) {*this *= p.inverse();return *this;}ModInt operator-() const { return ModInt(-x); }ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }bool operator==(const ModInt &p) const { return x == p.x; }bool operator!=(const ModInt &p) const { return x != p.x; }ModInt inverse() const {int a = x, b = mod, u = 1, v = 0, t;while(b > 0) {t = a / b;swap(a -= t * b, b);swap(u -= t * v, v);}return ModInt(u);}ModInt pow(int64_t n) const {ModInt ret(1), mul(x);while(n > 0) {if(n & 1) ret *= mul;mul *= mul;n >>= 1;}return ret;}friend ostream &operator<<(ostream &os, const ModInt &p) {return os << p.x;}friend istream &operator>>(istream &is, ModInt &a) {int64_t t;is >> t;a = ModInt< mod >(t);return (is);}static int get_mod() { return mod; }};using m17 = ModInt<1'000'000'007>;using m98 = ModInt<998'244'353>;using MOD = m98;ll mod = 998'244'353;// using MOD = m17;// ll mod = 1'000'000'007;const int _B = 500500;V<MOD> g1(_B);V<MOD> g2(_B);V<MOD> inverse(_B);void prepare() {g1[0] = g1[1] = g2[0] = g2[1] = 1;inverse[0] = 0;inverse[1] = 1;range(i,2,_B,1) {g1[i] = g1[i-1]*i;inverse[i] = -inverse[mod%i]*(mod/i);g2[i] = g2[i-1]*inverse[i];}}template<typename T>MOD cmb(T n, T r) {assert(g1[0]==1);if (r<0 || r>n) return 0;if (g1.size()<=n) {int s = g1.size();g1.resize(n+1);g2.resize(n+1);inverse.resize(n+1);range(i, s, n+1, 1) {g1[i] = g1[i-1]*i;inverse[i] = -inverse[mod%i]*(mod/i);g2[i] = g2[i-1]*inverse[i];}}r = min(r, n-r);return g1[n]*g2[r]*g2[n-r];}template<typename T>MOD perm(T n, T r) {if (r<0 || r>n) return 0;return g1[n]*g2[n-r];}void Main(){prepare();ll n,k;cin >> n >> k;MOD ans = 0;rep(v,n+1) {MOD val = cmb(n-2, v) + cmb(n-2, v-1);ans += val * MOD(v).pow(k);}cout << ans << "\n";}int main(void){std::ifstream in("tmp_in");if (TEST) {std::cin.rdbuf(in.rdbuf());std::cout << std::fixed << std::setprecision(15);} else {std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);std::cout << std::fixed << std::setprecision(15);}Main();}