delete pics to save space

2.211.cpp

@@ -0,0 +1,79 @@
+#include<cstdio>
+#include<cstring>
+const int R=7,C=8,N=30;
+const int d[2][2]={{0,1},{1, 0}};
+int ans,t[R][C],g[R][C],vis[R][C],rec[N];
+bool init()
+{
+	ans=0;
+	memset(rec,0,sizeof(rec));
+	memset(vis,0,sizeof(vis));
+	for(int i=0;i<R;i++)
+		for(int j=0;j<C;j++)
+			if(scanf("%d",&g[i][j])!=1)
+				return false;
+	return true;
+}
+void SetUp()
+{
+	int c=1;
+	for(int i=0;i<R;i++)
+		for(int j=i;j<R;j++)
+			t[i][j]=t[j][i]=c++;
+}
+inline void put()
+{
+	for(int i=0;i<R;i++)
+	{
+		for(int j=0;j<C;j++)
+			printf("%4d",vis[i][j]);
+		printf("\n");
+	}
+	printf("\n");
+}
+void dfs(int x,int y,int c)
+{
+	if(c==28)
+	{
+		ans++;
+		put();
+		return;
+	}
+	if(y==C) x++,y=0; 
+	if(vis[x][y]) dfs(x,y+1,c);
+	else
+		for(int i=0;i<2;i++)
+		{
+			int p=x+d[i][0],q=y+d[i][1];
+			if(p>=R||q>=C||vis[p][q]) continue;
+			int k=t[g[x][y]][g[p][q]];
+			if(rec[k]) continue;
+			vis[x][y]=vis[p][q]=k;
+			rec[k]=1;
+			dfs(x,y+1,c+1);
+			rec[k]=vis[x][y]=vis[p][q]=0;
+		}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	SetUp();
+	int kase=0;
+	while(init())
+	{
+		if(kase) printf("\n\n\n");
+		printf("Layout #%d:\n\n",++kase);
+		for(int i=0;i<R;i++)
+		{
+			for(int j=0;j<C;j++)
+				printf("%4d",g[i][j]);
+			printf("\n");
+		}
+		printf("\nMaps resulting from layout #%d are:\n\n",kase); 
+		dfs(0,0,0);
+		printf("There are %d solution(s) for layout #%d.\n",ans,kase);
+	}
+	return 0;
+}