poj2411 状压dp

#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;

long long dp[12][1<<11];
bool ins[1<<11];

int main(){
    int n,m;
   while(scanf("%d%d",&n,&m)&&n){
    for (int i=0;i<(1<<m);i++){
        bool cnt=0,x=0;
        for (int j=0;j<m;j++){
            if((i>>j)&1) cnt|=x,x=0;
            else x^=1;
        }
        ins[i]= cnt|x ? 0 : 1;
    }
    dp[0][0]=1;
    for (int i=1;i<=n;i++){
        for (int j=0;j<(1<<m);j++){
            dp[i][j]=0;
            for (int k=0;k<(1<<m);k++){
                if((j&k)==0 && ins[j|k])
                    dp[i][j]+=dp[i-1][k];
            }
        }
    }
   printf("%lld\n",dp[n][0]);
}
return 0;
}