> Source Code
> 
> Problem: 1069  User: yzhw 
> Memory: 320K  Time: 79MS 
> Language: GCC  Result: Accepted 
> 
> Source Code 
> # include <stdio.h>
> # include <stdlib.h>
> # include <stdbool.h>
> bool map[52][52];
> int num,n,list[11];
> void printmap()
> {
>      int i,j;
>      for(i=1;i<=2*n;i++)
>      {
>        for(j=1;j<4*n;j++) printf("%d ",map[i][j]);
>        printf("\n");
>      }
>      printf("\n\n");
> }
> bool canput(int r,int c,int len)
> {
>    int i,j;
>    if(r+len-1>2*n||c+len-1>4*n) return 0;
>    if(c%2==0)
>    {
>       for(i=r;i<r+len;i++)
>         for(j=c+2*(i-r);j<c+2*(i-r)+2*len-1-2*(i-r);j++)
>           if(map[i][j]) return 0;
>    } 
>    else
>    {
>        for(i=r;i<r+len;i++)
>          for(j=c;j<c+2*(i-r+1)-1;j++)
>            if(map[i][j]) return 0;
>    }
>    return 1;
> }
> void put(int r,int c,int len)
> {
>    int i,j;
>    if(c%2==0)
>    {
>       for(i=r;i<r+len;i++)
>         for(j=c+2*(i-r);j<c+2*(i-r)+2*len-1-2*(i-r);j++)
>           map[i][j]=1;
>    } 
>    else
>    {
>        for(i=r;i<r+len;i++)
>          for(j=c;j<c+2*(i-r+1)-1;j++)
>            map[i][j]=1;
>    }
> }
> void deput(int r,int c,int len)
> {
>    int i,j;
>    if(c%2==0)
>    {
>       for(i=r;i<r+len;i++)
>         for(j=c+2*(i-r);j<c+2*(i-r)+2*len-1-2*(i-r);j++)
>           map[i][j]=0;
>    } 
>    else
>    {
>        for(i=r;i<r+len;i++)
>          for(j=c;j<c+2*(i-r+1)-1;j++)
>            map[i][j]=0;
>    }
> }
> bool detect(int r,int c)
> {
>    if(r>2*n) return 1;
>    else if(c>4*n) return detect(r+1,1);
>    else if(map[r][c])
>    {
>      int i;
>      for(i=c;i<=4*n;i++)
>        if(!map[r][i]) break;
>      return detect(r,i);
>    }
>    else
>    {
>      int i;
>      for(i=1;i<=num;i++)
>      {
>        if(canput(r,c,list[i]))
>        {
>         put(r,c,list[i]);
>         if(detect(r,c+1)) return 1;
>         deput(r,c,list[i]);
>        }
>        else break;
>      }
>      return 0;
>    }
> }
> int cmp(const void *a,const void *b)
> {
>   return *(int *)a-*(int *)b;
> }
> int main()
> {
>     int test,i,k;
>     scanf("%d",&test);
>     for(i=1;i<=test;i++)
>     {
>         int j;
>         bool flag=0;
>         scanf("%d",&n);
>         scanf("%d",&num);
>         for(j=1;j<=num;j++) scanf("%d",&list[j]);
>         qsort(list+1,num,sizeof(int),cmp);
>         for(j=1;j<=num;j++)/*优化*/ 
>         {
>          if(n%list[j]==0)
>           {
>            printf("YES\n");
>            flag=1;
>            break;
>           }
>           if(list[j]>n)
>           {
>            num=j-1;
>            break;
>           }
>          }
>          if(flag) continue;
>          for(j=1;j<=num;j++)
>            for(k=1;k<j;k++)
>              {
>               if(list[j]%list[k]==0)
>               {
>                 int l;
>                 for(l=j;l<num;l++) list[l]=list[l+1];
>                 j--;
>                 num--;
>                 break;
>               }
>               }
>          /*---------------------------------------------*/ 
>          memset(map,1,sizeof(map));
>          for(j=1;j<=n;j++)
>            for(k=1;k<=2*n+1+(j-1)*2;k++)
>              map[j][k]=0;
>          for(j=n+1;j<=2*n;j++)
>             for(k=(j-n)*2;k<=4*n;k++)
>               map[j][k]=0;
>          if(detect(1,1)) printf("YES\n");
>          else printf("NO\n");
>     }
>    
>     return 0;
> }
>