delete pics to save space

2.1252.cpp

@@ -0,0 +1,63 @@
+#include<cstdio>
+#include<ctime>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int maxn=128,maxm=11;
+int kase,n,m;
+char obj[maxn][maxm+100];
+int vis[1<<maxm][1<<maxm],d[1<<maxm][1<<maxm];
+int cnt[1<<maxm][1<<maxm];
+int dp(int s,int a)
+{
+	if(cnt[s][a]<=1) return 0;
+	if(cnt[s][a]==2) return 1;
+
+	int &res=d[s][a],k,s2,a2,need;
+	if(vis[s][a]==kase) return res;
+	vis[s][a]=kase;
+	res=m;
+	for(k=0;k<m;k++)
+		if(!(s&(1<<k)))
+		{
+			s2=s|(1<<k),a2=a|(1<<k);
+			if(cnt[s2][a2]>=1&&cnt[s2][a]>=1)
+			{
+				need=max(dp(s2,a2),dp(s2,a))+1;
+				res=min(res,need);
+			}
+		}
+	return res;
+}
+inline void init()
+{
+	for(int s=0;s<(1<<m);s++)
+	{
+		for(int a=s;a;a=(a-1)&s)
+			cnt[s][a]=0;
+		cnt[s][0]=0;
+	}
+	for(int i=0;i<n;i++)
+	{
+		int ft=0;
+		for(int f=0;f<m;f++)
+			if(obj[i][f]=='1') ft|=(1<<f);
+		for(int s=0;s<(1<<m);s++)
+			cnt[s][s&ft]++;
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	memset(vis,0,sizeof(vis));
+	while(scanf("%d%d",&m,&n)==2&&n)
+	{
+		++kase;
+		for(int i=0;i<n;i++) scanf("%s",obj[i]);
+		init();
+		printf("%d\n",dp(0,0));
+	}
+	return 0;
+}