結果
問題 | No.93 ペガサス |
ユーザー |
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提出日時 | 2016-05-12 23:27:22 |
言語 | C++11 (gcc 13.3.0) |
結果 |
AC
|
実行時間 | 23 ms / 5,000 ms |
コード長 | 2,957 bytes |
コンパイル時間 | 1,337 ms |
コンパイル使用メモリ | 160,588 KB |
実行使用メモリ | 19,272 KB |
最終ジャッジ日時 | 2024-10-05 14:07:25 |
合計ジャッジ時間 | 2,156 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 16 |
ソースコード
#define DEB#include<bits/stdc++.h>#define REP(i,m) for(int i=0;i<(m);++i)#define REPN(i,m,in) for(int i=(in);i<(m);++i)#define ALL(t) (t).begin(),(t).end()#define CLR(a) memset((a),0,sizeof(a))#define pb push_back#define mp make_pair#define fr first#define sc secondusing namespace std;#ifdef DEB#define dump(x) cerr << #x << " = " << (x) << endl#define prl cerr<<"called:"<< __LINE__<<endltemplate<class T> void debug(T a,T b){ for(;a!=b;++a) cerr<<*a<<' ';cerr<<endl;}#else#define dump(x) ;#define prl ;template<class T> void debug(T a,T b){ ;}#endiftemplate<class T> void chmin(T& a,const T& b) { if(a>b) a=b; }template<class T> void chmax(T& a,const T& b) { if(a<b) a=b; }typedef long long int lint;typedef pair<int,int> pi;namespace std{template<class S,class T>ostream &operator <<(ostream& out,const pair<S,T>& a){out<<'('<<a.fr<<','<<a.sc<<')';return out;}}template<lint mod>struct Int_{unsigned x;unsigned mpow(Int_ a,unsigned k){Int_ res=1;while(k){if(k&1) res=res*a;a=a*a;k>>=1;}return res.x;}unsigned inverse(Int_ a){return mpow(a,mod-2);}Int_(): x(0) { }Int_(long long sig) {int sigt=sig%mod;if(sigt<0) sigt+=mod;x=sigt;}unsigned get() const { return (unsigned)x; }Int_ &operator+=(Int_ that) { if((x += that.x) >= mod) x -= mod; return *this; }Int_ &operator-=(Int_ that) { if((x += mod - that.x) >= mod) x -= mod; return *this; }Int_ &operator*=(Int_ that) { x = (unsigned long long)x * that.x % mod; return *this; }Int_ &operator=(Int_ that) { x=that.x; return *this;}Int_ &operator/=(Int_ that) { x=(unsigned long long) x * inverse(that.x)%mod; return *this;}bool operator==(Int_ that) const { return x==that.x; }bool operator!=(Int_ that) const { return x!=that.x; }Int_ operator-() const { return Int_(0)-Int_(*this);}Int_ operator+(Int_ that) const { return Int_(*this) += that; }Int_ operator-(Int_ that) const { return Int_(*this) -= that; }Int_ operator*(Int_ that) const { return Int_(*this) *= that; }Int_ operator/(Int_ that) const { return Int_(*this) /= that; }};namespace std{template<lint mod>ostream &operator <<(ostream& out,const Int_<mod>& a){out<<a.get();return out;}template<lint mod>istream &operator >>(istream& in,Int_<mod>& a){in>>a.x;return in;}};typedef Int_<1000000007> Int;//const int INF=5e8;Int dp[1005][1005][2][2];int n;int main(){cin>>n;dp[1][0][0][0]=1;dp[2][0][0][0]=2;for(int i=2;i<n;++i) REP(j,i+1) REP(t,2) REP(t2,2) if(dp[i][j][t][t2]!=0){Int val=dp[i][j][t][t2];dp[i+1][j+1][t2][1]+=val*(2-t);dp[i+1][j][t2][1]+=val*t;dp[i+1][j][t2][0]+=val*(i+1-j-(2-t));if(j) dp[i+1][j-1][t2][0]+=val*(j-t-t2);if(j) dp[i+1][j-1][0][0]+=val*t2;}Int res=0;REP(t,2) REP(t2,2) res+=dp[n][0][t][t2];cout<<res<<endl;return 0;}