以下是我的代码：
/*
* Author: lee1r
* Created Time: 2011/8/6 9:35:45
* File Name: poj1321.cpp
*/
#include<iostream>
#include<sstream>
#include<fstream>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<stack>
#include<map>
#include<set>
#include<bitset>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cctype>
#include<cmath>
#include<ctime>
#define L(x) ((x)<<1)
#define R(x) (((x)<<1)+1)
#define Half(x) ((x)>>1)
#define lowbit(x) ((x)&(-(x)))
using namespace std;
const int kInf(0x7f7f7f7f);
const double kEps(1e-8);
typedef long long int64;
typedef unsigned long long uint64;
const int kMaxn(10);
int n,k;
int64 ans;
bool g[kMaxn][kMaxn],row[kMaxn],col[kMaxn];
void dfs(int depth,int now)
{
if(now==k)
{
ans++;
return;
}
if(depth>n)
return;
dfs(depth+1,now);
for(int i=1;i<=n;i++)
if(!row[i] && !col[i] && g[depth][i])
{
row[i]=col[i]=true;
dfs(depth+1,now+1);
row[i]=col[i]=false;
}
}
int main()
{
//freopen("data.in","r",stdin);
while(scanf("%d%d",&n,&k)==2 && (n!=-1 || k!=-1))
{
for(int i=1;i<=n;i++)
{
getchar();
for(int j=1;j<=n;j++)
{
char ch;
scanf("%c",&ch);
if(ch=='#')
g[i][j]=true;
else
g[i][j]=false;
}
}
ans=0;
memset(row,false,sizeof(row));
memset(col,false,sizeof(col));
dfs(1,0);
cout<<ans<<endl;
}
return 0;
}
posted on 2011-08-06 09:45
lee1r 阅读(417)
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