Mongodb合并Polygon [问题点数:200分,无满意结帖,结帖人yyj135]

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mongodb的concatArrays使用
shell语法: { project:{                      items:{project:{ items:{ concatArrays:['top10′,′top10’,’other’]
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讨论在此 https://www.v2ex.com/t/416419 转载于:https://www.cnblogs.com/zyxx/p/8636053.html
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Polygon的合并问题!
假设现在我有多个Polygon,比如中国各省和自治区的Polygon,它们要么相邻要么相离,如何得到一个大Polygon,它是所有多边形的并,就是不包含相邻多边形的公共线!怎么求,谢谢!
Polygon
Polygon is a game for one player that starts on a <em>polygon</em> with N vertices, like the one in Figure 1, where N=4. Each vertex is labelled with an integer and each edge is labelled with either the symbol + (addition) or the symbol * (product). The edges are numbered from 1 to N. nnnOn the first move, one of the edges is removed. Subsequent moves involve the following steps: n�pick an edge E and the two vertices V1 and V2 that are linked by E; and n�replace them by a new vertex, labelled with the result of performing the operation indicated in E on the labels of V1 and V2. nThe game ends when there are no more edges, and its score is the label of the single vertex remaining. nnConsider the <em>polygon</em> of Figure 1. The player started by removing edge 3. After that, the player picked edge 1, then edge 4, and, finally, edge 2. The score is 0. nnnWrite a program that, given a <em>polygon</em>, computes the highest possible score and lists all the edges that, if removed on the first move, can lead to a game with that score. nInputnnYour program is to read from standard input. The input describes a <em>polygon</em> with N vertices. It contains two lines. On the first line is the number N. The second line contains the labels of edges 1, ..., N, interleaved with the vertices' labels (first that of the vertex between edges 1 and 2, then that of the vertex between edges 2 and 3, and so on, until that of the vertex between edges N and 1), all separated by one space. An edge label is either the letter t (representing +) or the letter x (representing *). nn3 <= 50 nFor any sequence of moves, vertex labels are in the range [-32768,32767]. nOutputnnYour program is to write to standard output. On the first line your program must write the highest score one can get for the input <em>polygon</em>. On the second line it must write the list of all edges that, if removed on the first move, can lead to a game with that score. Edges must be written in increasing order, separated by one space.nSample Inputnn4nt -7 t 4 x 2 x 5nSample Outputnn33n1 2
raster to polygon
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『区间DP』Polygon
题目描述 Polygon is a game for one player that starts on a <em>polygon</em> with N vertices, like the one in Figure 1, where N=4. Each vertex is labelled with an integer and each edge is labelled with either the s...
Restore the Polygon
There is a <em>polygon</em> A1A2...An(the vertices Ai are numbered in the clockwise order). On each side AiAi+1 an isosceles triangle AiMiAi+1 is built on the outer side of the <em>polygon</em>, and angle AiMiAi+1 = ai. Here An+1 = A1.nnThe set of angles ai satisfies a condition that the sum of angles in any of its nonempty subsets is not aliquot to 360 degrees.nnYou are given n(which is not greater than 50) co-ordinates of vertices Mi and angles ai(measured in degrees). Write a program which restores co-ordinates of the <em>polygon</em> vertices.nnInputnnThe input consists of multiple test cases. In each test case, the first line is an integer n, the next n lines contain pairs of real numbers which are co-ordinates of points Mi. And the last n lines of the file consist of degree values of angles ai. Input ends with EOF.nnOutputnnThe output file should contain n lines of pairs of coordinates of the points with value rounded to two digitis after the decimal point. Print a blank line between two test cases.nnSample Inputnn3n0 2n3 3n2 0n90n90n90nSample Output:nn1.00 1.00n1.00 3.00n3.00 1.00
mongodb怎么实现两个表之间的数据转移
1、同一实例下: use db_source; var docs = db_source.collection_souce.find(); use db_target; docs.forEach({db.collection_target.insert(d)}); 2、不同Mongodb实例之间,可以使用mongodump和mongorestore,先备份,后恢复: mongodump ...
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前几天,在工作中遇到一个需求,需要将一个集合复制一份并且在复制后的集合上进行一些后处理,当时同事使用脚本进行的处理,先使用db.collection.copyTo()进行复制集合,然后在js脚本中遍历新集合中的记录,查询出需要处理的记录并进行相应更新处理。 可是当时在现网执行的时候却出现了问题,在执行db.collection.copyTo()这个命令的时候,现网出现了频繁的告警(后台做
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   问题来源:https://groups.google.com/forum/#!topic/<em>mongodb</em>-user/BpgEaRqrKsA      Collection C1的部分数据如下:   要求按name分组,每组数据是相同的name对应的子文档中的users字段,且数据不能重复。计算结果类似:      集算器代码:   A1:连接MongoDB,连接字格式为mo...
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expand polygon?
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mongodb mapreduce数据合并不全
表结构是 rnname 张三 ,value 112rnname 李四 ,value 3213rnname 王二 ,value 987rnname 麻子 ,value 987rn... ...rnrn目标是做一个类似sql里面的sum操作, 求出 value之和 , 初学<em>mongodb</em>,没有用group,想试试mapreduce,rn用的是java的morphia组件, 其中map和reduce函数如下( count用来查看统计了多少条数据,total为统计结果) :rn[code=Java]rnString map = "function()emit( '1','v':this.value); ";rnString reduce = "function(key, values) var count=0;var total=0;for(var i in values) total=+values[i].v;count++; rnreturn 'count':count,'total':total;";rn[/code]rnrn[color=#FF0000]实际数据是1500条,可运行完毕后,count只有500,也就是只统计了其中500条数据[/color],rn从输出的日志看到,reduce拆分了两次,这500条是第二次执行的结果,第一次执行的1000被遗忘了, 在网上搜索一天了,实在没有头绪了,只有向大伙请教,应该怎么处理呢?rnrn输出的日志是:rn[code=Java]rn "result" : "t_1326391379413" , "timeMillis" : 118 , "timing" :rn "mapTime" : 72 , "emitLoop" : 107 , "reduceTime" : 19 , "mode" : "mixed" , "total" : 118 , "counts" : rn "input" : 1500 , "emit" : 1500 , "reduce" : 2 , "output" : 1 , "ok" : 1.0rn[/code] rnrn
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A closed <em>polygon</em> is a figure bounded by a finite number of line segments. The intersections of the bounding line segments are called the vertices of the <em>polygon</em>. When one starts at any vertex of a closed <em>polygon</em> and traverses each bounding line segment exactly once, one comes back to the starting vertex.nnA closed <em>polygon</em> is called convex if the line segment joining any two points of the <em>polygon</em> lies in the <em>polygon</em>. Figure 1 shows a closed <em>polygon</em> which is convex and one which is not convex. (Informally, a closed <em>polygon</em> is convex if its border doesn't have any "dents".)nnnThe subject of this problem is a closed convex <em>polygon</em> in the coordinate plane, one of whose vertices is the origin (x = 0, y = 0). Figure 2 shows an example. Such a <em>polygon</em> will have two properties significant for this problem.nnThe first property is that the vertices of the <em>polygon</em> will be confined to three or fewer of the four quadrants of the coordinate plane. In the example shown in Figure 2, none of the vertices are in the second quadrant (where x < 0, y > 0).nnTo describe the second property, suppose you "take a trip" around the <em>polygon</em>: start at (0, 0), visit all other vertices exactly once, and arrive at (0, 0). As you visit each vertex (other than (0, 0)), draw the diagonal that connects the current vertex with (0, 0), and calculate the slope of this diagonal. Then, within each quadrant, the slopes of these diagonals will form a decreasing or increasing sequence of numbers, i.e., they will be sorted. Figure 3 illustrates this point.nn nnInputnnThe input file lists the vertices of a closed convex <em>polygon</em> in the plane. The number of lines in the input file will be at least three but no more than 50. Each line contains the x and y coordinates of one vertex. Each x and y coordinate is an integer in the range -999..999. The vertex on the first line of the input file will be the origin, i.e., x = 0 and y = 0. Otherwise, the vertices may be in a scrambled order. Except for the origin, no vertex will be on the x-axis or the y-axis. No three vertices are colinear.nnOutputnnThe output lists the vertices of the given <em>polygon</em>, one vertex per line. Each vertex from the input appears exactly once in the output. The origin (0,0) is the vertex on the first line of the output. The order of vertices in the output will determine a trip taken along the <em>polygon</em>'s border, in the counterclockwise direction. The output format for each vertex is (x,y) as shown below.nnThis problem contains multiple test cases!nnThe first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.nnThe output format consists of N output blocks. There is a blank line between output blocks.nnSample Inputnn1nn0 0n70 -50n60 30n-30 -50n80 20n50 -60n90 -20n-30 -40n-10 -60n90 10nSample Outputnn(0,0)n(-30,-40)n(-30,-50)n(-10,-60)n(50,-60)n(70,-50)n(90,-20)n(90,10)n(80,20)n(60,30)n
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Given an arbitrary <em>polygon</em> with n vertices p1... pn. Tell at most how many edges can be touched by any single radial from the origin.nNotice that an edge means the line segment between two adjacent vertices, and, a radial is said to touch an edge iff it has at least one point in common with the edge, and also, the origin will never be on the <em>polygon</em>.nnnInputnnThere are multiple testcases.nnThe first line contains only a positive number n (n <= 10000), the number of vertices of the <em>polygon</em>.nnThe following n lines gives the coordinates of the n points, as the Sample Input shows.nnnOutputnnFor each testcase, print a line containing only the max number of edges that can be touched.nnnSample Inputnn3n1 0n-1 1n-1 -1nnnSample Outputnn2
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[img=http://img.my.csdn.net/uploads/201211/23/1353653610_7106.jpg][/img]rn
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