delete pics to save space

1.1562.cpp

@@ -0,0 +1,28 @@
+#include<cstdio>
+#include<cassert>
+#include<algorithm>
+using namespace std;
+int n,tot,inv,lg[1<<15]; char mp[15][15];
+void dfs(int dep,int M,int L,int R)
+{
+	if(dep==n) { tot++; return; }
+	int can=M|L|R;
+	for(int it=inv&(can^inv);it;it-=it&-it)
+	{
+		int i=lg[it&-it];
+		if(mp[dep][i]!='.') dfs(dep+1,M|(1<<i),(L|(1<<i))<<1,(R|(1<<i))>>1);
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	for(int i=0;i<n;i++) scanf("%s",mp[i]);
+	inv=(1<<n)-1;
+	for(int i=0;i<n;i++) lg[1<<i]=i;
+	dfs(0,0,0,0);
+	printf("%d\n",tot);
+	return 0;
+}