結果
問題 | No.2135 C5 |
ユーザー | sigma425 |
提出日時 | 2022-11-28 01:00:29 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 69 ms / 2,000 ms |
コード長 | 5,654 bytes |
コンパイル時間 | 2,097 ms |
コンパイル使用メモリ | 208,424 KB |
実行使用メモリ | 5,248 KB |
最終ジャッジ日時 | 2024-10-04 17:33:13 |
合計ジャッジ時間 | 5,000 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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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 |
---|---|---|
testcase_00 | AC | 2 ms
5,248 KB |
testcase_01 | AC | 2 ms
5,248 KB |
testcase_02 | AC | 2 ms
5,248 KB |
testcase_03 | AC | 65 ms
5,248 KB |
testcase_04 | AC | 1 ms
5,248 KB |
testcase_05 | AC | 1 ms
5,248 KB |
testcase_06 | AC | 2 ms
5,248 KB |
testcase_07 | AC | 2 ms
5,248 KB |
testcase_08 | AC | 2 ms
5,248 KB |
testcase_09 | AC | 1 ms
5,248 KB |
testcase_10 | AC | 2 ms
5,248 KB |
testcase_11 | AC | 1 ms
5,248 KB |
testcase_12 | AC | 2 ms
5,248 KB |
testcase_13 | AC | 1 ms
5,248 KB |
testcase_14 | AC | 2 ms
5,248 KB |
testcase_15 | AC | 21 ms
5,248 KB |
testcase_16 | AC | 66 ms
5,248 KB |
testcase_17 | AC | 65 ms
5,248 KB |
testcase_18 | AC | 50 ms
5,248 KB |
testcase_19 | AC | 2 ms
5,248 KB |
testcase_20 | AC | 17 ms
5,248 KB |
testcase_21 | AC | 2 ms
5,248 KB |
testcase_22 | AC | 5 ms
5,248 KB |
testcase_23 | AC | 63 ms
5,248 KB |
testcase_24 | AC | 25 ms
5,248 KB |
testcase_25 | AC | 67 ms
5,248 KB |
testcase_26 | AC | 11 ms
5,248 KB |
testcase_27 | AC | 10 ms
5,248 KB |
testcase_28 | AC | 54 ms
5,248 KB |
testcase_29 | AC | 66 ms
5,248 KB |
testcase_30 | AC | 67 ms
5,248 KB |
testcase_31 | AC | 66 ms
5,248 KB |
testcase_32 | AC | 66 ms
5,248 KB |
testcase_33 | AC | 65 ms
5,248 KB |
testcase_34 | AC | 66 ms
5,248 KB |
testcase_35 | AC | 2 ms
5,248 KB |
testcase_36 | AC | 2 ms
5,248 KB |
testcase_37 | AC | 2 ms
5,248 KB |
testcase_38 | AC | 2 ms
5,248 KB |
testcase_39 | AC | 5 ms
5,248 KB |
testcase_40 | AC | 3 ms
5,248 KB |
testcase_41 | AC | 69 ms
5,248 KB |
testcase_42 | AC | 15 ms
5,248 KB |
testcase_43 | AC | 2 ms
5,248 KB |
testcase_44 | AC | 1 ms
5,248 KB |
testcase_45 | AC | 32 ms
5,248 KB |
testcase_46 | AC | 2 ms
5,248 KB |
testcase_47 | AC | 12 ms
5,248 KB |
testcase_48 | AC | 66 ms
5,248 KB |
testcase_49 | AC | 66 ms
5,248 KB |
testcase_50 | AC | 68 ms
5,248 KB |
testcase_51 | AC | 68 ms
5,248 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll = long long; using uint = unsigned int; using ull = unsigned long long; #define rep(i,n) for(int i=0;i<int(n);i++) #define rep1(i,n) for(int i=1;i<=int(n);i++) #define per(i,n) for(int i=int(n)-1;i>=0;i--) #define per1(i,n) for(int i=int(n);i>0;i--) #define all(c) c.begin(),c.end() #define si(x) int(x.size()) #define pb push_back #define eb emplace_back #define fs first #define sc second template<class T> using V = vector<T>; template<class T> using VV = vector<vector<T>>; template<class T,class U> bool chmax(T& x, U y){ if(x<y){ x=y; return true; } return false; } template<class T,class U> bool chmin(T& x, U y){ if(y<x){ x=y; return true; } return false; } template<class T> void mkuni(V<T>& v){sort(all(v));v.erase(unique(all(v)),v.end());} template<class T> int lwb(const V<T>& v, const T& a){return lower_bound(all(v),a) - v.begin();} template<class T> V<T> Vec(size_t a) { return V<T>(a); } template<class T, class... Ts> auto Vec(size_t a, Ts... ts) { return V<decltype(Vec<T>(ts...))>(a, Vec<T>(ts...)); } template<class S,class T> ostream& operator<<(ostream& o,const pair<S,T> &p){ return o<<"("<<p.fs<<","<<p.sc<<")"; } template<class T> ostream& operator<<(ostream& o,const vector<T> &vc){ o<<"{"; for(const T& v:vc) o<<v<<","; o<<"}"; return o; } constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n-1); } #ifdef LOCAL #define show(x) cerr << "LINE" << __LINE__ << " : " << #x << " = " << (x) << endl void dmpr(ostream& os){os<<endl;} template<class T,class... Args> void dmpr(ostream&os,const T&t,const Args&... args){ os<<t<<" ~ "; dmpr(os,args...); } #define shows(...) cerr << "LINE" << __LINE__ << " : ";dmpr(cerr,##__VA_ARGS__) #define dump(x) cerr << "LINE" << __LINE__ << " : " << #x << " = {"; \ for(auto v: x) cerr << v << ","; cerr << "}" << endl; #else #define show(x) void(0) #define dump(x) void(0) #define shows(...) void(0) #endif template<class D> D divFloor(D a, D b){ return a / b - (((a ^ b) < 0 && a % b != 0) ? 1 : 0); } template<class D> D divCeil(D a, D b) { return a / b + (((a ^ b) > 0 && a % b != 0) ? 1 : 0); } template<unsigned int mod_> struct ModInt{ using uint = unsigned int; using ll = long long; using ull = unsigned long long; constexpr static uint mod = mod_; uint v; ModInt():v(0){} ModInt(ll _v):v(normS(_v%mod+mod)){} explicit operator bool() const {return v!=0;} static uint normS(const uint &x){return (x<mod)?x:x-mod;} // [0 , 2*mod-1] -> [0 , mod-1] static ModInt make(const uint &x){ModInt m; m.v=x; return m;} ModInt operator+(const ModInt& b) const { return make(normS(v+b.v));} ModInt operator-(const ModInt& b) const { return make(normS(v+mod-b.v));} ModInt operator-() const { return make(normS(mod-v)); } ModInt operator*(const ModInt& b) const { return make((ull)v*b.v%mod);} ModInt operator/(const ModInt& b) const { return *this*b.inv();} ModInt& operator+=(const ModInt& b){ return *this=*this+b;} ModInt& operator-=(const ModInt& b){ return *this=*this-b;} ModInt& operator*=(const ModInt& b){ return *this=*this*b;} ModInt& operator/=(const ModInt& b){ return *this=*this/b;} ModInt& operator++(int){ return *this=*this+1;} ModInt& operator--(int){ return *this=*this-1;} template<class T> friend ModInt operator+(T a, const ModInt& b){ return (ModInt(a) += b);} template<class T> friend ModInt operator-(T a, const ModInt& b){ return (ModInt(a) -= b);} template<class T> friend ModInt operator*(T a, const ModInt& b){ return (ModInt(a) *= b);} template<class T> friend ModInt operator/(T a, const ModInt& b){ return (ModInt(a) /= b);} ModInt pow(ll p) const { if(p<0) return inv().pow(-p); ModInt a = 1; ModInt x = *this; while(p){ if(p&1) a *= x; x *= x; p >>= 1; } return a; } ModInt inv() const { // should be prime return pow(mod-2); } // ll extgcd(ll a,ll b,ll &x,ll &y) const{ // ll p[]={a,1,0},q[]={b,0,1}; // while(*q){ // ll t=*p/ *q; // rep(i,3) swap(p[i]-=t*q[i],q[i]); // } // if(p[0]<0) rep(i,3) p[i]=-p[i]; // x=p[1],y=p[2]; // return p[0]; // } // ModInt inv() const { // ll x,y; // extgcd(v,mod,x,y); // return make(normS(x+mod)); // } bool operator==(const ModInt& b) const { return v==b.v;} bool operator!=(const ModInt& b) const { return v!=b.v;} bool operator<(const ModInt& b) const { return v<b.v;} friend istream& operator>>(istream &o,ModInt& x){ ll tmp; o>>tmp; x=ModInt(tmp); return o; } friend ostream& operator<<(ostream &o,const ModInt& x){ return o<<x.v;} }; using mint = ModInt<998244353>; //using mint = ModInt<1000000007>; V<mint> fact,ifact,invs; mint Choose(int a,int b){ if(b<0 || a<b) return 0; return fact[a] * ifact[b] * ifact[a-b]; } void InitFact(int N){ //[0,N] N++; fact.resize(N); ifact.resize(N); invs.resize(N); fact[0] = 1; rep1(i,N-1) fact[i] = fact[i-1] * i; ifact[N-1] = fact[N-1].inv(); for(int i=N-2;i>=0;i--) ifact[i] = ifact[i+1] * (i+1); rep1(i,N-1) invs[i] = fact[i-1] * ifact[i]; } int main(){ cin.tie(0); ios::sync_with_stdio(false); //DON'T USE scanf/printf/puts !! cout << fixed << setprecision(20); InitFact(1000); int N,M; cin >> N >> M; VV<mint> dp(N+1,V<mint>(N+1)); dp[0][0] = 1; rep(i,N) rep(j,i+1) if(dp[i][j]){ rep1(di,N){ if(i+di > N) break; if(di == 1){ dp[i+di][j] += dp[i][j] * Choose(N-i-1,di-1); } if(di >= 2){ dp[i+di][j+di-1] += dp[i][j] * fact[di] * invs[2] * Choose(N-i-1,di-1); } if(di >= 5){ dp[i+di][j+di] += dp[i][j] * fact[di-1] * invs[2] * Choose(N-i-1,di-1); } } } M = N*(N-1)/2-M; if(M > N) cout << 0 << endl; else cout << dp[N][M] << endl; }