結果
| 問題 | No.310 2文字しりとり |
| ユーザー |
 LayCurse
|
| 提出日時 | 2015-12-03 00:57:40 |
| 言語 | C++11 (gcc 11.4.0) |
| 結果 |
MLE
|
| 実行時間 | - |
| コード長 | 8,312 bytes |
| コンパイル時間 | 2,722 ms |
| コンパイル使用メモリ | 162,832 KB |
| 実行使用メモリ | 814,404 KB |
| 最終ジャッジ日時 | 2024-09-14 08:16:17 |
| 合計ジャッジ時間 | 10,906 ms |
|
ジャッジサーバーID （参考情報） |
judge1 / judge4 |
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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 | MLE | - |
| testcase_01 | -- | - |
| testcase_02 | -- | - |
| testcase_03 | -- | - |
| testcase_04 | -- | - |
| testcase_05 | -- | - |
| testcase_06 | -- | - |
| testcase_07 | -- | - |
| testcase_08 | -- | - |
| testcase_09 | -- | - |
| testcase_10 | -- | - |
| testcase_11 | -- | - |
| testcase_12 | -- | - |
| testcase_13 | -- | - |
| testcase_14 | -- | - |
| testcase_15 | -- | - |
| testcase_16 | -- | - |
| testcase_17 | -- | - |
| testcase_18 | -- | - |
| testcase_19 | -- | - |
| testcase_20 | -- | - |
| testcase_21 | -- | - |
| testcase_22 | -- | - |
| testcase_23 | -- | - |
| testcase_24 | -- | - |
| testcase_25 | -- | - |
| testcase_26 | -- | - |
| testcase_27 | -- | - |
コンパイルメッセージ
main.cpp: In member function ‘unsigned int mint::setmod(unsigned int)’:
main.cpp:41:675: warning: no return statement in function returning non-void [-Wreturn-type]
41 | unsigned setmod(unsigned m){int i;unsigned t;W=32;md=m;R=(1ULL<<W)%md;RR=(ull)R*R%md;switch(m){case 104857601:Rinv=2560000;mdninv=104857599;break;case 998244353:Rinv=232013824;mdninv=998244351;break;case 1000000007:Rinv=518424770;mdninv=2226617417U;break;case 1000000009:Rinv=171601999;mdninv=737024967;break;case 1004535809:Rinv=234947584;mdninv=1004535807;break;case 1007681537:Rinv=236421376;mdninv=1007681535;break;case 1012924417:Rinv=238887936;mdninv=1012924415;break;case 1045430273:Rinv=254466304;mdninv=1045430271;break;case 1051721729:Rinv=257538304;mdninv=1051721727;break;default:Rinv=get_inv(R,md);mdninv=0;t=0;rep(i,W){if(t%2==0)t+=md,mdninv|=(1U<<i);t/=2;}}}
| ^
main.cpp: In function ‘void reader(double*)’:
main.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
15 | void reader(double *x){scanf("%lf",x);}
| ~~~~~^~~~~~~~~
ソースコード
#include<bits/stdc++.h>
using namespace std;
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)
#define ll long long
#define ull unsigned ll
void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(double *x){scanf("%lf",x);}
int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
template <class T, class S, class U, class V> void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);}
void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(double x, char c){printf("%.15f",x);mypc(c);}
void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);}
void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}
template<class T, class S> void writerLn(T x, S y){writer(x,' ');writer(y,'\n');}
template<class T, class S, class U> void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');}
char memarr[17000000]; void *mem = memarr;
#define MD 1000000007
int get_inv(ll a, int md){ll t=a,s=md,u=1,v=0,e;while(s){e=t/s;t-=e*s;u-=e*v;swap(t,s);swap(u,v);}if(u<0)u+=md;return u;}
struct mint{
static unsigned md, W, R, Rinv, mdninv, RR;
unsigned val;
mint(){}mint(int a){val=mulR(a);}mint(unsigned a){val=mulR(a);}mint(ll a){val=mulR(a);}mint(ull a){val=mulR(a);}
unsigned setmod(unsigned m){int i;unsigned t;W=32;md=m;R=(1ULL<<W)%md;RR=(ull)R*R%md;switch(m){case 104857601:Rinv=2560000;mdninv=104857599;break;case 998244353:Rinv=232013824;mdninv=998244351;break;case 1000000007:Rinv=518424770;mdninv=2226617417U;break;case 1000000009:Rinv=171601999;mdninv=737024967;break;case 1004535809:Rinv=234947584;mdninv=1004535807;break;case 1007681537:Rinv=236421376;mdninv=1007681535;break;case 1012924417:Rinv=238887936;mdninv=1012924415;break;case 1045430273:Rinv=254466304;mdninv=1045430271;break;case 1051721729:Rinv=257538304;mdninv=1051721727;break;default:Rinv=get_inv(R,md);mdninv=0;t=0;rep(i,W){if(t%2==0)t+=md,mdninv|=(1U<<i);t/=2;}}}
unsigned mulR(unsigned a){return(ull)a*R%md;}unsigned mulR(int a){if(a<0)a=a%md+md;return mulR((unsigned)a);}unsigned mulR(ull a){return mulR((unsigned)(a%md));}unsigned mulR(ll a){if(a<0)a=a%md+md;return mulR((unsigned)a);}
unsigned reduce(unsigned T){unsigned m=T*mdninv;unsigned t=(unsigned)((T+(ull)m*md)>>W);if(t>=md)t-=md;return t;}unsigned reduce(ull T){unsigned m=(unsigned)T*mdninv;unsigned t=(unsigned)((T+(ull)m*md)>>W);if(t>=md)t-=md;return t;}
unsigned get(){return reduce(val);}
mint&operator+=(mint a){val+=a.val;if(val>=md)val-=md;return*this;}mint&operator-=(mint a){if(val<a.val)val=val+md-a.val;else val-=a.val;return*this;}mint&operator*=(mint a){val=reduce((ull)val*a.val);return*this;}mint&operator/=(mint a){return*this*=a.inverse();}
mint operator+(mint a){return mint(*this)+=a;}mint operator-(mint a){return mint(*this)-=a;}mint operator*(mint a){return mint(*this)*=a;}mint operator/(mint a){return mint(*this)/=a;}
mint operator+(int a){return mint(*this)+=mint(a);}mint operator-(int a){return mint(*this)-=mint(a);}mint operator*(int a){return mint(*this)*=mint(a);}mint operator/(int a){return mint(*this)/=mint(a);}
mint operator+(ll a){return mint(*this)+=mint(a);}mint operator-(ll a){return mint(*this)-=mint(a);}mint operator*(ll a){return mint(*this)*=mint(a);}mint operator/(ll a){return mint(*this)/=mint(a);}
mint operator-(void){mint res;if(val)res.val=md-val;else res.val=0;return res;}
operator bool(void){return val!=0;}operator int(void){return get();}operator ll(void){return get();}
mint inverse(){int a=val,b=md,u=1,v=0,t;mint r;while(b){t=a/b;a-=t*b;swap(a,b);u-=t*v;swap(u,v);}if(u<0)u+=md;r.val=(ull)u*RR%md;return r;}
mint pw(ull b){mint a(*this),r;r.val=R;while(b){if(b&1)r*=a;b>>=1;a*=a;}return r;}
bool operator==(int a){return get()==a;}
bool operator!=(int a){return get()!=a;}
};
unsigned mint::md, mint::W, mint::R, mint::Rinv, mint::mdninv, mint::RR;
mint operator+(int a, mint b){return mint(a)+=b;}mint operator-(int a, mint b){return mint(a)-=b;}mint operator*(int a, mint b){return mint(a)*=b;}mint operator/(int a, mint b){return mint(a)/=b;}
mint operator+(ll a, mint b){return mint(a)+=b;}mint operator-(ll a, mint b){return mint(a)-=b;}mint operator*(ll a, mint b){return mint(a)*=b;}mint operator/(ll a, mint b){return mint(a)/=b;}
mint mval[10000], minv[10000];
void mint_init(int md=MD, mint val[]=mval, int vals=10000, mint inv[]=minv, int invs=10000){int i;val[0].setmod(md);val[0].val=0;REP(i,1,vals){val[i].val=val[i-1].val+mint::R;if(val[i].val >=md)val[i].val-=md;}inv[1].val=1;REP(i,2,invs){inv[i].val=md-((ll)(md/i)*inv[md%i].val%md);}REP(i,1,invs)inv[i].val=(ull)inv[i].val*mint::R%md;}
void unionInit(int d[],int s){int i;rep(i,s)d[i]=i;}
int unionGet(int d[],int n){int t=n,k;while(d[t]!=t)t=d[t];while(d[n]!=n)k=d[n],d[n]=t,n=k;return n;}
int unionConnect(int d[],int a,int b){a=unionGet(d,a);b=unionGet(d,b);if(a==b)return 0;d[a]=b;return 1;}
int N, M;
int A[4100], B[4100];
int deg[4100], sdeg[4100];
int edge[4100][4100];
mint mat[4100][4100];
mint fact[4100];
int ind[4100];
int main(){
int i, j, k, s;
int cnt;
mint res, t;
mint_init();
fact[0] = mval[1];
REP(i,1,4001) fact[i] = fact[i-1] * mval[i];
reader(&N,&M);
rep(i,M) reader(A+i,B+i), A[i]--, B[i]--;
rep(i,M) deg[A[i]]--, deg[B[i]]++;
cnt = 0;
rep(i,N){
if(deg[i]==-1) cnt++;
if(deg[i]<-1) cnt+=2;
}
if(cnt >= 2){ writerLn("0"); return 0; }
rep(i,N) rep(j,N) edge[i][j] = 1;
rep(i,M) edge[A[i]][B[i]] = 0;
if(cnt==1){
rep(i,N) if(deg[i]==-1) break;
rep(j,N) if(deg[j]== 1) break;
edge[i][j]++;
}
for(;;){
rep(i,N){
rep(j,N) if(edge[i][j]) break;
if(j==N){
N--;
rep(j,N) edge[i][j] = edge[N][j];
rep(j,N) edge[j][i] = edge[j][N];
i = -1111;
break;
}
}
if(i==N) break;
}
if(N==0){ writerLn(1); return 0; }
unionInit(ind, N);
rep(i,N) rep(j,N) if(edge[i][j]) unionConnect(ind,i,j);
rep(i,N) if(unionGet(ind,i)!=unionGet(ind,0)) break;
if(i<N){writerLn(0); return 0; }
rep(i,N) sdeg[i] = 0;
rep(i,N) rep(j,N) sdeg[i] += edge[i][j];
k = 0;
rep(i,N) if(sdeg[i] < sdeg[k]) k = i;
rep(j,N) swap(edge[k][j], edge[N-2][j]);
rep(j,N) swap(edge[j][k], edge[j][N-2]);
res = 1;
rep(i,N) res *= fact[sdeg[i]-1];
rep(i,N) rep(j,N) mat[i][j] = mval[0];
rep(i,N) rep(j,N) if(i!=j){
mat[i][j] -= edge[i][j];
mat[i][i] += edge[i][j];
}
// rep(i,N) mat[i][i] += edge[i][i];
s = N-1;
rep(i,s-1) rep(j,s) mat[i][j] -= mat[s-1][j];
// rep(i,N){ rep(j,N) printf("%d ",(int)mat[i][j]); puts(""); } puts("");
rep(i,s-1){
REP(j,i,s) if(mat[j][i].val != 0) break;
if(j!=i) rep(k,s) swap(mat[i][k], mat[j][k]);
REP(j,i+1,s){
t = mat[j][i] / mat[i][i];
if(t.val==0) continue;
REP(k,i,s){
// printf("%d %d : %d -> ",j,k,(int)mat[j][k]);
mat[j][k] -= mat[i][k] * t;
// printf("%d\n",(int)mat[j][k]);
}
}
}
// rep(i,N){ rep(j,N) printf("%d ",(int)mat[i][j]); puts(""); } puts("");
rep(i,s) res *= mat[i][i];
if(cnt==0){
k = N*N - M;
res *= mint(k);
}
writerLn((int)res);
return 0;
}