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eft

时间:2019-05-29 23:26:01      阅读:187      评论:0      收藏:0      [点我收藏+]
#include<bits/stdc++.h>
#define reg register int
#define il inline
#define fi first
#define se second
#define mk(a,b) make_pair(a,b)
#define numb (ch^‘0‘)
#define pb push_back
#define solid const auto &
#define enter cout<<endl
#define pii pair<int,int>
using namespace std;
typedef long long ll;
template<class T>il void rd(T &x){
    char ch;x=0;bool fl=false;while(!isdigit(ch=getchar()))(ch==-)&&(fl=true);
    for(x=numb;isdigit(ch=getchar());x=x*10+numb);(fl==true)&&(x=-x);}
template<class T>il void output(T x){if(x/10)output(x/10);putchar(x%10+0);}
template<class T>il void ot(T x){if(x<0) putchar(-),x=-x;output(x);putchar( );}
template<class T>il void prt(T a[],int st,int nd){for(reg i=st;i<=nd;++i) ot(a[i]);putchar(\n);}
namespace Modulo{
const int mod=1e9+7;
int ad(int x,int y){return (x+y)>=mod?x+y-mod:x+y;}
void inc(int &x,int y){x=ad(x,y);}
int mul(int x,int y){return (ll)x*y%mod;}
void inc2(int &x,int y){x=mul(x,y);}
int qm(int x,int y=mod-2){int ret=1;while(y){if(y&1) ret=mul(x,ret);x=mul(x,x);y>>=1;}return ret;}
}
using namespace Modulo;
namespace Miracle{
const int N=16;
int iv2,iv4;
int n,m;
struct node{
    int c,d,v;
    node(){}
    node(int cc,int dd,int vv){
        c=cc;d=dd;v=vv;
    }
}ano[1600];
int to[N];
int hf;
unordered_map<int,int>mp;
int merge(int le,int ri){
    return (le<<n)|ri;
}
int dp(int s){
    cout<<" ss "<<s<<endl;
    if(s==0) return 1;
    if(mp.count(s)) return mp.count(s);
    
    int le=s>>n,ri=s&hf;
    int now=le&(-le),id=log2(now);
    int ret=0;
    cout<<"af "<<s<<" le "<<le<<" ri "<<ri<<endl;
    cout<<" now "<<now<<" id "<<id<<endl;
    for(reg t=0;t<n;++t){
        cout<<" tt "<<t<<endl;
        if(to[id]&(1<<t)){
            if(ri&(1<<t)){
                ret=ad(ret,mul(iv2,dp(merge(le-now,ri-(1<<t)))));
                int lp=id*100+t;
                cout<<"lp "<<lp<<endl;
                if(ano[lp].v){
                    int c=ano[lp].c,d=ano[lp].d;
                    cout<<" c "<<c<<" d "<<d<<" id "<<id<<" t "<<t<<endl;
                    if(((le-now)&(1<<c))&&((ri-(1<<t)&(1<<d)))) ret=ad(ret,mul(ano[lp].v,dp(merge(le-now-(1<<c),ri-(1<<t)-(1<<d)))));
                }
            }
        }
    }
    return mp[s]=ret;
}
int main(){
    iv2=qm(2);
    iv4=qm(4);
    rd(n);rd(m);
    int t,x,y,c,d;
    for(reg i=1;i<=m;++i){
        rd(t);rd(x);rd(y);
        --x;--y;
        if(t==0){
            to[x]|=(1<<y);
        }else if(t==1){
            rd(c);rd(d);
            --c;--d;
            if(c==x) {
                to[x]|=(1<<d);
                to[x]|=(1<<y);
            }
            else{
                if(c<x) swap(x,c),swap(y,d);
                to[x]|=(1<<y);
                to[c]|=(1<<d);
                ano[x*100+y]=node(c,d,iv4); 
            }
        }else if(t==2){
            rd(c);rd(d);
            --c;--d;
            if(c==x) {
                to[x]|=(1<<d);
                to[x]|=(1<<y);
            }
            else{
                if(c<x) swap(x,c),swap(y,d);
                to[x]|=(1<<y);
                to[c]|=(1<<d);
                ano[x*100+y]=node(c,d,mod-iv4); 
            }
        }
    }
    hf=(1<<n)-1;
    int ans=dp((1<<(2*n))-1);
    ans=mul(ans,qm(2,n));
    ot(ans);
    return 0;
}

}
signed main(){
    Miracle::main();
    return 0;
}

/*
   Author: *Miracle*
*/

 

eft

原文:https://www.cnblogs.com/Miracevin/p/10946709.html

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