delete pics to save space

history_source/信息学奥赛一本通/3.4.7.1.cpp

@@ -0,0 +1,82 @@
+#include<cstdio>
+#include<algorithm>
+#include<vector>
+#include<cstdlib>
+using namespace std;
+struct node1
+{
+	int x1,y1,x2,y2;
+};
+struct node2
+{
+	int x,y,id;
+};
+int n;
+node1 ps[27];
+node2 po[27];
+vector<int> e[27];
+bool hsh[27],found;
+int  res[27],ans[27];
+void dfs(int pos)
+{
+	if(pos>n)
+	{
+		if(found)
+		{
+			printf("None\n");
+			exit(0);
+		}
+		found=1;
+		for(int i=1;i<=n;i++) ans[i]=res[i];
+		return;
+	}
+	for(int i=e[pos].size()-1;i>=0;i--)
+		if(!hsh[e[pos][i]])
+		{
+			hsh[e[pos][i]]=1;
+			res[pos]=e[pos][i];
+			dfs(pos+1);
+			hsh[e[pos][i]]=0;
+		}
+}
+int main()
+{
+	freopen("slides.in","r",stdin);
+	freopen("slides.out","w",stdout);
+	scanf("%d",&n);
+	for(int i=1;i<=n;i++)
+		scanf("%d%d%d%d",&ps[i].x1,&ps[i].x2,&ps[i].y1,&ps[i].y2);
+	for(int i=1;i<=n;i++)//po[i].id=i
+	{
+		scanf("%d%d",&po[i].x,&po[i].y);
+		po[i].id=i;
+	}
+	for(int i=1;i<=n;i++)
+	{
+		for(int j=1;j<=n;j++)
+			if(ps[i].x1<=po[j].x&&po[j].x<=ps[i].x2
+			   &&ps[i].y1<=po[j].y&&po[j].y<=ps[i].y2)
+			   e[i].push_back(j);
+	}
+	dfs(1);
+	if(found) for(int i=1;i<=n;i++) printf("%c %d\n",i+'A'-1,ans[i]);
+	else printf("None\n");
+//	for(int i=1;i<=n;i++)
+//	{
+//		printf("%c:",i+'A'-1);
+//		for(int j=0;j<e[i].size();j++) printf(" %d",e[i][j]);
+//		printf("\n");
+//	}
+	return 0;
+}
+/*
+4
+6 22 10 20
+4 18 6 16
+8 20 2 18
+10 24 4 8
+9 15
+19 17
+11 7
+21 11
+*/