SQL如下面: update mapping_nj_roads set municipality='227' from mapping_geodata_boundary a where a.supportfile_code='227' and (a.boundary.STContains(mapping_nj_roads.geom)=1 or a.boundary.STIntersects(mapping_nj_roads.geom)=1) #1 mapping_nj_roads 是新泽西的全部
原题 给出一个房子(线段)的端点坐标,和一条路的两端坐标,给出一些障碍物(线段)的两端坐标.问在路上能看到完整房子的最大连续长度是多长. 将障碍物按左端点坐标排序,然后用房子的右端与障碍物的左端连线,房子的左端和前一障碍物的右端比较,得出在道路上的能看到的长度取Max即可 #include<cstdio> #include<algorithm> using namespace std; double a,b,c,l,lmx,ans; int n,pos; struct point
Jack Straws Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs o
#include<stdio.h> #include<math.h> const double eps=1e-8; int n; struct Point { double x,y; Point (){} Point (double _x,double _y) { x=_x; y=_y; } Point operator -(const Point &b)const { return Point (x-b.x,y-b.y); } double operator *(cons
7.3 Given two lines on a Cartesian plane, determine whether the two lines would intersect. 这道题说是在笛卡尔坐标系中,让我们确定两条直线是否相交. 那么我们首先要写个直线的类来表示直线,最常见的表示方法为y=kx+b,k为斜率,b为与y轴的交点,然后我们来考虑什么情况下两条直线会相交,首先,如果两条直线完全重合的话,应该也算是相交的,其次如果两条直线不平行的话,那么也是相交的,那么我们判断相交条件主要基于
You can Solve a Geometry Problem too Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9596 Accepted Submission(s): 4725 Problem Description Many geometry(几何)problems were designed in the ACM/I