delete pics to save space

2.1343.cpp

@@ -0,0 +1,84 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int line[8][7]={
+	{ 0, 2, 6,11,15,20,22}, // A
+	{ 1, 3, 8,12,17,21,23}, // B
+	{10, 9, 8, 7, 6, 5, 4}, // C
+	{19,18,17,16,15,14,13}, // D
+};
+
+const int rev[8]={5,4,7,6,1,0,3,2};
+const int center[8]={6,7,8,11,12,15,16,17};
+
+int a[24];
+char ans[1000];
+
+bool is_final()
+{
+	for(int i=0;i<8;i++)
+		if(a[center[i]]!=a[center[0]]) return false;
+	return true;
+}
+
+int diff(int target)
+{
+	int ans=0;
+	for(int i=0;i<8;i++)
+		if(a[center[i]]!=target) ans++;
+	return ans;
+}
+
+inline int h()
+{
+	return min(min(diff(1),diff(2)),diff(3));
+}
+
+inline void move(int i)
+{
+	int tmp=a[line[i][0]];
+	for(int j=0;j<6;j++) a[line[i][j]]=a[line[i][j+1]];
+	a[line[i][6]]=tmp;
+}
+
+bool dfs(int d,int maxd)
+{
+	if(is_final())
+	{
+		ans[d]='\0';
+		printf("%s\n",ans);
+		return true;
+	}
+	if(d+h()>maxd) return false;
+	for(int i=0;i<8;i++)
+	{
+		ans[d]='A'+i;
+		move(i);
+		if(dfs(d+1,maxd)) return true;
+		move(rev[i]);
+	}
+	return false;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	for(int i=4;i<8;i++)
+		for(int j=0;j<7;j++)
+			line[i][j]=line[rev[i]][6-j];
+	while(scanf("%d",&a[0])==1&&a[0])
+	{
+		for(int i=1;i<24;i++) scanf("%d",&a[i]);
+		for(int i=0;i<24;i++) if(!a[i]) return 0;
+		if(is_final())
+			printf("No moves needed\n");
+		else
+		{
+			for(int maxd=1; ;maxd++)
+				if(dfs(0,maxd)) break;
+		}
+		printf("%d\n",a[6]);
+	}
+	return 0;
+}