AC通道:http://www.lydsy.com/JudgeOnline/problem.php?id=1087
【题解】
用f[i][j][k]表示前i行放了j个棋子且第i行的状态为k的方案数。
vis[i]表示状态i是否合法,check[i][j]表示状态i,j是否可以相邻。
详见代码:
/*************
bzoj 1087
by chty
2016.11.15
*************/
#include
#include
#include
#include
#include
#include
#include
using namespace std;
typedef long long ll;
#define FILE "read"
#define up(i,j,n) for(ll i=j;i<=n;i++)
namespace INIT{
char buf[1<<15],*fs,*ft;
inline char getc() {return (fs==ft&&(ft=(fs=buf)+fread(buf,1,1<<15,stdin),fs==ft))?0:*fs++;}
inline ll read() {
ll x=0,f=1; char ch=getc();
while(!isdigit(ch)) {if(ch=='-') f=-1; ch=getc();}
while(isdigit(ch)) {x=x*10+ch-'0'; ch=getc();}
return x*f;
}
}using namespace INIT;
ll n,m,ans,vis[1<<9],sum[1<<9],check[1<<9][1<<9],f[11][121][1<<9];
void pre(){
up(i,0,(1<>=1) sum[i]+=(x&1);}
up(i,0,(1<>1))||(j&(i>>1))) continue;
check[i][j]=1;
}
}
}
int main(){
freopen(FILE".in","r",stdin);
freopen(FILE".out","w",stdout);
n=read(); m=read();
pre(); up(i,0,(1<