UVA 11270 Tiling Dominoes（轮廓线DP经典）

题意：用1*2的骨牌覆盖n*m的棋盘有多少种方法

这道题注意一下不要按照大白书上把maxn开成15就好，因为每次都要memset如果开到15会tle，开到11就可以

#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
#include<iostream>
#include<algorithm>
#include<vector>
#include<map>
#include<queue>
#include<stack>
#include<string>
#include<map>
#include<set>
#define eps 1e-6
#define LL long long
#define pii (pair<int, int>)
//#pragma comment(linker, "/STACK:1024000000,1024000000")
using namespace std;
//const int INF = 0x3f3f3f3f;
//freopen("input.txt", "r", stdin);
int n, m, cur;
const int maxn = 11;
LL d[2][1<<maxn];

int main() {
	while(scanf("%d%d", &n, &m) == 2) {
		if(m > n) swap(m, n);
		cur = 0;
		memset(d[cur], 0, sizeof(d[cur]));
		d[cur][(1<<m)-1] = 1;
		for(int i = 0; i < n; i++)
			for(int j = 0; j < m; j++) {
				cur ^= 1;
				memset(d[cur], 0, sizeof(d[cur]));
				for(int k = 0; k < (1<<m); k++) {
					if(k&(1<<(m-1))) d[cur][(k<<1)^(1<<m)] += d[1-cur][k]; //不放
					if(i && !(k&(1<<(m-1)))) d[cur][(k<<1)+1] += d[1-cur][k];
					if(j && !(k&1) && (k&(1<<(m-1)))) d[cur][(k<<1)^(1<<m)|3] += d[1-cur][k];
				}
			}
		LL ans = d[cur][(1<<m)-1];
		printf("%lld\n", ans);
	}
	return 0;
}

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