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(中等) HDU 4069 Squiggly Sudoku , DLX+精确覆盖。

  Description

  Today we play a squiggly sudoku, The objective is to fill a 9*9 grid with digits so that each column, each row, and each of the nine Connecting-sub-grids that compose the grid contains all of the digits from 1 to 9. 
Left figure is the puzzle and right figure is one solution. 
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  Now, give you the information of the puzzle, please tell me is there no solution or multiple solution or one solution.
 
  还是数独问题,其实和前面的没有什么两样,然后对于每个奇形怪状的9格子,我是用BFS来构造的。。。。。。
 
代码如下:
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#include<iostream>#include<cstring>#include<cstdio>#include<queue>using namespace std;const int MaxN=800;const int MaxM=350;const int MaxNode=MaxN*MaxM;int map1[10][10];struct DLX{    int U[MaxNode],D[MaxNode],L[MaxNode],R[MaxNode],col[MaxNode],row[MaxNode];    int size,n,m;    int H[MaxN],S[MaxM];    int ans[100],ans1[100],anst[100];    int ansnum,depth;    void init(int _n,int _m)    {        ansnum=0;        n=_n;        m=_m;        for(int i=0;i<=m;++i)        {            U[i]=D[i]=i;            L[i]=i-1;            R[i]=i+1;            row[i]=0;            S[i]=0;        }        L[0]=m;        R[m]=0;        size=m;        for(int i=1;i<=n;++i)            H[i]=-1;    }    void Link(int r,int c)    {        col[++size]=c;        row[size]=r;        ++S[c];        U[size]=U[c];        D[size]=c;        D[U[c]]=size;        U[c]=size;        if(H[r]==-1)            H[r]=L[size]=R[size]=size;        else        {            L[size]=L[H[r]];            R[size]=H[r];            R[L[H[r]]]=size;            L[H[r]]=size;        }    }    void remove(int c)    {        L[R[c]]=L[c];        R[L[c]]=R[c];        for(int i=D[c];i!=c;i=D[i])            for(int j=R[i];j!=i;j=R[j])            {                U[D[j]]=U[j];                D[U[j]]=D[j];                --S[col[j]];            }    }    void resume(int c)    {        for(int i=U[c];i!=c;i=U[i])            for(int j=L[i];j!=i;j=L[j])            {                U[D[j]]=j;                D[U[j]]=j;                ++S[col[j]];            }        L[R[c]]=R[L[c]]=c;    }    void showans()    {        for(int i=0;i<depth;++i)            ans1[(anst[i]-1)/9+1]=(anst[i]-1)%9+1;        for(int i=1;i<=81;++i)        {            cout<<ans1[i];            if(i%9==0)                cout<<endl;        }    }    void copyans()    {        for(int i=0;i<100;++i)            anst[i]=ans[i];    }    bool Dance(int d)    {        if(R[0]==0)        {            depth=d;            if(ansnum)            {                ++ansnum;                return 1;            }            ++ansnum;            copyans();            return 0;        }        int c=R[0];        for(int i=R[0];i!=0;i=R[i])            if(S[i]<S[c])                c=i;        remove(c);        for(int i=D[c];i!=c;i=D[i])        {            ans[d]=row[i];            for(int j=R[i];j!=i;j=R[j])                remove(col[j]);            if(Dance(d+1))                return 1;            for(int j=L[i];j!=i;j=L[j])                resume(col[j]);        }        resume(c);        return 0;    }    void display()    {        for(int i=R[0];i!=0;i=R[i])        {            cout<<i<< ;            for(int j=D[i];j!=i;j=D[j])                cout<<(<<j<<,<<(row[j]-1)%9+1<<)<< ;            cout<<endl;        }    }};DLX dlx;int s[100];void getchange(int &r,int &c1,int &c2,int &c3,int &c4,int i,int j,int k){    r=(i*9+j)*9+k;    c1=i*9+j+1;    c2=i*9+k+81;    c3=j*9+k+162;    c4=map1[i][j]*9+k+243;}void slove(){    int r,c1,c2,c3,c4;    dlx.init(729,324);    for(int i=0;i<9;++i)        for(int j=0;j<9;++j)            for(int k=1;k<=9;++k)                if(s[i*9+j]==0 || s[i*9+j]==k)                {                    getchange(r,c1,c2,c3,c4,i,j,k);                    dlx.Link(r,c1);                    dlx.Link(r,c2);                    dlx.Link(r,c3);                    dlx.Link(r,c4);                }/*    for(int i=1;i<=81;++i)        for(int j=1;j<=9;++j)            dlx.Link(j+(i-1)*9,i);    for(int i=1;i<=81;++i)        for(int j=1;j<=9;++j)            dlx.Link(9*(j-1)+(i-1)%9+1+81*((i-1)/9),i+81);    for(int i=1;i<=81;++i)        for(int j=1;j<=9;++j)            dlx.Link((j-1)*81+i,i+162);    for(int i=1;i<=3;++i)        for(int j=1;j<=3;++j)            for(int k=1;k<=9;++k)                for(int l=1;l<=3;++l)                    for(int m=1;m<=3;++m)                        dlx.Link((i-1)*243+(j-1)*27+k+(l-1)*81+(m-1)*9,(i-1)*27+(j-1)*9+k+243);    for(int i=0;i<81;++i)        if(s[i]!=‘.‘)        {            dlx.ans1[i+1]=s[i]-‘0‘;            dlx.remove(i+1);            for(int j=dlx.D[i+1];j!=i+1;j=dlx.D[j])            {                if((dlx.row[j]-1)%9+1==s[i]-‘0‘)                {                    for(int k=dlx.R[j];k!=j;k=dlx.R[k])                        dlx.remove(dlx.col[k]);                                        break;                }            }        }*/    dlx.Dance(0);    int temp=dlx.ansnum;    if(temp==0)        cout<<"No solution"<<endl;    else if(temp==2)        cout<<"Multiple Solutions"<<endl;    else        dlx.showans();}const int step[4][2]={{-1,0},{0,1},{1,0},{0,-1}};int kcou;int lu[10][10][4];void bfs(int num,int x,int y){    queue <int> que;    int temp,t1,t2;    que.push(x*10+y);    map1[x][y]=num;    while(!que.empty())    {        temp=que.front();        que.pop();        t1=temp/10;        t2=temp%10;        for(int k=0;k<4;++k)            if(lu[t1][t2][k] && map1[t1+step[k][0]][t2+step[k][1]]==-1)            {                que.push((t1+step[k][0])*10+t2+step[k][1]);                map1[t1+step[k][0]][t2+step[k][1]]=num;            }    }}void getmap(){    int cou=0;    for(int i=0;i<9;++i)        for(int j=0;j<9;++j)            if(map1[i][j]==-1)                bfs(cou++,i,j);}int main(){    ios::sync_with_stdio(false);    int T,t;    int fang[4];    cin>>T;    for(int cas=1;cas<=T;++cas)    {        memset(map1,-1,sizeof(map1));        memset(s,0,sizeof(s));        memset(lu,0,sizeof(lu));        kcou=0;        for(int i=0;i<9;++i)            for(int j=0;j<9;++j)            {                cin>>t;                for(int k=0;k<4;++k)                    if(((t>>(4+k))&1)==0)                        lu[i][j][k]=1;                s[i*9+j]=t&15;            }        getmap();        cout<<"Case "<<cas<<:<<endl;        slove();    }    return 0;}
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(中等) HDU 4069 Squiggly Sudoku , DLX+精确覆盖。