delete pics to save space

2.225.cpp

@@ -0,0 +1,92 @@
+#include<cstdio>
+#include<cstring>
+#include<conio.h>
+int vis[800][800],res[50],n,k,cnt;
+char nc[]={'e','n','s','w'};
+const int dx[]={+1,+0,+0,-1};
+const int dy[]={+0,+1,-1,+0};
+const int n1[]={1,0,0,1};
+const int n2[]={2,3,3,2};
+void init()
+{
+	memset(vis,0,sizeof(vis));
+	cnt=0;
+	scanf("%d%d",&n,&k);
+	int x,y;
+	for(int i=0;i<k;i++)
+	{
+		scanf("%d%d",&x,&y);
+		x+=400;y+=400;
+		if(x>=0&&x<800&&y>=0&&y<800)
+		{
+//			printf("stone in(%d,%d)\n",x,y);
+			vis[x][y]=1;
+		}
+	}
+}
+void dfs(int step,int nx,int ny,int np)
+{
+//	for(int i=0;i<step;i++) printf("    ");
+//	printf("vis(%d,%d,%d)!\n",nx,ny,np);
+	if(step>=n)
+	{
+		if(nx==400&&ny==400)
+		{
+			for(int i=0;i<n;i++) printf("%c",nc[res[i]]);
+			printf("\n");
+			cnt++;
+//			for(int i=0;i<step;i++) printf("    ");
+//			printf("    found!\n");
+//			getch();
+		}
+		return;
+	}
+//	if(vis[nx][ny]) return;
+	bool ok;
+	res[step]=n1[np];
+	ok=1;
+	for(int i=0;i<=step+1;i++)
+		if(vis[nx+dx[n1[np]]*i][ny+dy[n1[np]]*i])
+		{
+			ok=0;
+			break;
+		}
+	if(ok) dfs(step+1,nx+dx[n1[np]]*(step+1),ny+dy[n1[np]]*(step+1),n1[np]);
+	
+	res[step]=n2[np];
+	ok=1;
+	for(int i=0;i<=step+1;i++)
+		if(vis[nx+dx[n2[np]]*i][ny+dy[n2[np]]*i])
+		{
+			ok=0;
+			break;
+		}
+	if(ok) dfs(step+1,nx+dx[n2[np]]*(step+1),ny+dy[n2[np]]*(step+1),n2[np]);
+}
+void solve()
+{
+	if(vis[0][0]) printf("Found 0 golygon(s).\n\n");
+	else
+	{
+		for(int i=0;i<4;i++)
+		{
+			res[0]=i;
+			dfs(1,400+dx[i],400+dy[i],i);
+		}
+		printf("Found %d golygon(s).\n\n",cnt);
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	int t;
+	scanf("%d",&t);
+	while(t-->0)
+	{
+		init();
+		solve();
+	}
+	return 0;
+}