delete pics to save space

2.11825.cpp

@@ -0,0 +1,41 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+#include<cassert>
+using namespace std;
+const int maxn=16;
+int n,m,x,kase;
+int p[maxn];
+int cover[1<<maxn];
+int f[1<<maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	while(scanf("%d",&n)==1&&n)
+	{
+		for(int i=0;i<n;i++)
+		{
+			scanf("%d",&m);
+			p[i]=1<<i;
+			while(m--) { scanf("%d",&x); p[i]|=1<<x; }
+		}
+		for(int s=0;s<(1<<n);s++)
+		{
+			cover[s]=0;
+			for(int i=0;i<n;i++)
+				if(s&(1<<i)) cover[s]|=p[i];
+		}
+		f[0]=0;
+		int ALL=(1<<n)-1;
+		for(int s=1;s<(1<<n);s++)
+		{
+			f[s]=0;
+			for(int st=s;st;st=(st-1)&s)
+				if(cover[st]==ALL) f[s]=max(f[s],f[s^st]+1);
+		}
+		printf("Case %d: %d\n",++kase,f[ALL]);
+	}
+	return 0;
+}