P1879 [USACO06NOV]玉米田Corn Fields

Posted 2021-03-11 feiief

Link

 

 

#include <bits/stdc++.h>
# define LL long
using namespace std;

const int mod=100000000;
int M, N;
int grid[12];
LL dp[12][1<<12];

LL dfs(int r, int state){
    if(r==M) return 1;
    if(dp[r][state]!=-1) return dp[r][state];
    dp[r][state]=0;
    for(int i=0;i<(1<<N);++i){
        if((i&(i<<1))>0 || (i&state)>0) continue;
        if((i&grid[r])!=i) continue;
        dp[r][state]+=dfs(r+1,i);
        dp[r][state]%=mod;
    }
    return dp[r][state];
}

int main(){
    scanf("%d %d", &M, &N);
    for(int i=0;i<M;++i){
        for(int j=0;j<N;++j){
            int a;
            scanf("%d", &a);
            if(a==1) grid[i]|=(1<<j);
        }
    }
    memset(dp,-1,sizeof(dp));
    int res=dfs(0,0);
    printf("%d", res);
    return 0;
}