mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
94 lines
1.9 KiB
C++
94 lines
1.9 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<string>
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#include<iostream>
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#include<cmath>
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#include<algorithm>
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using namespace std;
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struct node
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{
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int x,y;
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}nd[16];
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long long dp[1<<16][16];
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int n,m,gp[6][6],pos,gd[6][6],mp[6][6];
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int gcd(int x,int y)
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{
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if (y == 0)
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return x;
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return gcd(y, x % y);
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}
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bool ok(int x,int y,int sta)
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{
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int x1=nd[x].x,x2=nd[y].x,y1=nd[x].y,y2=nd[y].y;
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int dx=x2-x1;
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int dy=y2-y1;
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int c=gd[abs(dx)][abs(dy)];
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dx=dx/c;dy=dy/c;
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for(int i=0;i<=5;i++)
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{
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x1+=dx;y1+=dy;
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if(gp[x1][y1]==1)
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return false;
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else if(x1==x2&&y1==y2)
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return true;
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else if(gp[x1][y1]==0&&(sta&(1<<(mp[x1][y1])))==0)
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return false;
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}
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return false;
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}
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long long DP(int st,int k)
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{
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if(dp[st][k]!=-1)return dp[st][k];
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if(st==(1<<k)) dp[st][k]=1;
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else
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{
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dp[st][k]=0;
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for(int j=0;j<pos;j++)
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{
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if(((1<<j)&st)==0||j==k)continue;
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if(ok(j,k,st)==0)continue;
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dp[st][k]+=DP(st-(1<<k),j);
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}
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}
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return dp[st][k];
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}
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void work()
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{
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long long ans=0;
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memset(dp,-1,sizeof(dp));
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for(int i=0;i<pos;i++)
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DP((1<<pos)-1,i);
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for(int i=0;i<pos;i++)
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{
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ans+=dp[(1<<pos)-1][i];
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}
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cout<<ans<<'\n';
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}
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void init()
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{
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for(int i=0;i<6;i++)
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for(int j=0;j<6;j++)
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gd[i][j]=gcd(i,j);
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}
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int main()
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{
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init();
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while(scanf("%d%d",&n,&m)!=EOF)
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{
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pos=0;
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for(int i=0;i<n;i++)
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for(int j=0;j<m;j++)
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{
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scanf("%d",&gp[i][j]);
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if(gp[i][j]==0)
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{
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nd[pos].x=i;
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nd[pos++].y=j;
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mp[i][j]=pos-1;
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}
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}
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work();
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}
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return 0;
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}
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