给出一个n*m的01矩阵,里面为0的点不能放旗子,两个相邻的格子不能放旗子,求放法种数。
n,m<12
裸的状压DP,15行,每行一个12位01串表示。check就与一下。
#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <set>
#include <queue>
#include <algorithm>
#include <vector>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <stack>
#define INF 2147483647
#define LL long long
#define clr(x) memset(x, 0, sizeof x)
#define digit (ch < '0' || ch > '9')
using namespace std;
template <class T> inline void read(T &x) {
int flag = 1; x = 0;
register char ch = getchar();
while( digit) { if(ch == '-') flag = -1; ch = getchar(); }
while(!digit) { x = (x<<1)+(x<<3)+ch-'0'; ch = getchar(); }
x *= flag;
}
const int maxn = 13;
const int MOD = 100000000;
int n,m,maxs,opt,ans,dp[maxn][1<<maxn];
int a[maxn];
inline bool check1(int s, int ss) { return (!(s&(s<<1)) && !(ss&s)); }
inline bool check2(int s, int ss) { return !(s&ss); }
int main() {
freopen("chess.in","r",stdin);
freopen("chess.out","w",stdout);
read(n); read(m); maxs = (1<<m)-1;
for(register int i = 1; i <= n; i++)
for(register int j = 1; j <= m; j++) read(opt), a[i] += (!opt)<<(m-j);
for(register int i = 0; i <= maxs; i++) if(check1(i, a[1])) dp[1][i] = 1;
for(register int i = 2; i <= n; i++)
for(register int j = 0; j <= maxs; j++) if(check1(j, a[i-1]))
for(register int k = 0 ; k <= maxs; k++)
if(check1(k, a[i]) && check2(j, k)) dp[i][k] = (dp[i][k]+dp[i-1][j])%MOD;
for(register int i = 0; i <= maxs; i++) ans = (ans+dp[n][i])%MOD;
cout << ans;
return 0;
}