delete pics to save space

7.3349.cpp

@@ -0,0 +1,60 @@
+#include<cstdio>
+#include<cstring>
+using namespace std;
+const int maxn=100005;
+int n,tot,P=99991,snow[maxn][6],head[maxn],nxt[maxn];
+inline int hsh(int *a)
+{
+	int s=0,t=1;
+	for(int i=0;i<6;i++)
+	{
+		s=(s+a[i])%P;
+		t=(long long)t*a[i]%P;
+	}
+	return (s+t)%P;
+}
+inline bool equal(int *a,int *b)
+{
+	for(int i=0;i<6;i++)
+		for(int j=0;j<6;j++)
+		{
+			bool eq=1;
+			for(int k=0;k<6;k++)
+				if(a[(i+k)%6]!=b[(j+k)%6]) { eq=0; break; }
+			if(eq) return 1;
+			eq=1;
+			for(int k=0;k<6;k++)
+				if(a[(i+k)%6]!=b[(j-k+6)%6]) { eq=0; break; }
+			if(eq) return 1;
+		}
+	return 0;
+}
+inline bool insert(int *a)
+{
+	int val=hsh(a);
+	for(int i=head[val];i;i=nxt[i])
+		if(equal(snow[i],a)) return 1;
+	++tot;
+	memcpy(snow[tot],a,24);
+	nxt[tot]=head[val];
+	head[val]=tot;
+	return 0;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	for(int i=1;i<=n;i++)
+	{
+		int a[10]; for(int j=0;j<6;j++) scanf("%d",&a[j]);
+		if(insert(a))
+		{
+			puts("Twin snowflakes found.");
+			return 0;
+		}
+	}
+	puts("No two snowflakes are alike.");
+	return 0;
+}