作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/random-point-in-non-overlapping-rectangles/description/ 题目描述: Given a list of non-overlapping axis-aligned rectangles rects, write a function pick which rando…

1. 问题 给定一系列不重叠的矩形,在这些矩形中随机采样一个整数点. 2. 思路 (1)一个矩形的可采样点个数就相当于它的面积,可以先依次对每个矩形的面积累加存起来(相当于概率分布中的分布累积函数CDF,Cumulative Distribution Function). (2)从 [1, 总面积] 中随机取一个数n(面积),表示要取第几个点,找到这个点即可完成题目要求的随机采样. (3)找点可以先使用python的bisect_left方法,根据这个数(面积)在多个累加面积之间寻找合适的位置(…

Given two rectangles, find if the given two rectangles overlap or not. A rectangle is denoted by providing the x and y co-ordinates of two points: the left top corner and the right bottom corner of the rectangle. Note that two rectangles sharing a si…

https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Large%20E-Commerce%20Company/E-Commerce%20Company%20-%20Interview%20Problems%20-%20SOLUTIONS/On-Site%20Question%203%20-%20SOLUTION.ipyn…

There are nnn rectangles on the plane. The problem is to find the area of the union of these rectangles. Note that these rectangles might overlap with each other, and the overlapped areas of these rectangles shall not be counted more than once. For e…

There are nn rectangles on the plane. The problem is to find the area of the union of these rectangles. Note that these rectangles might overlap with each other, and the overlapped areas of these rectangles shall not be counted more than once. For ex…

2017-09-24 20:11:21 writer:pprp 找到的大神的代码,直接过了 采用了扫描线+线段树的算法,先码了,作为模板也不错啊 题目链接:https://nanti.jisuanke.com/t/17313 题意:给你很多个矩形,让你得到矩形的面积,重叠部分只算一次 代码如下: //ac F #include <stdio.h> #include <string.h> #include <stdlib.h> #include <iostream&…

Bryce1010模板 http://codeforces.com/contest/1008/problems #include <bits/stdc++.h> using namespace std; #define ll long long const int MAXN=1e5+10; const int INF=0x3f3f3f3f; struct REC { int w,h; }rec[MAXN]; int n; int main() { //cout << "H…

题意: 给定一个坐标系, 给出n个矩形的左下角坐标(bx,by)和右上角坐标(tx,ty) , 求矩形覆盖的面积, 有些区域会被多个矩形覆盖, 但只用算一次. n <= 1000,  0 <= bx,by,tx,ty <= 1e6 分析: 如果这题坐标范围很小的话, 其实可以直接开二维数组填充就好. 但因为坐标太大,无法开这样的数组,而且矩形数量不多,如果开这么大的数组很可能造成浪费,所以我们可以考虑离散化去做这题. 我觉得离散化的核心就是——用点去表示线段. 我们可以将n个矩形的2n个…

1. 问题 给定一个权重数组w,w[i]表示下标i的权重,根据权重从数组中随机抽取下标. 2. 思路 这道题相当于 497. Random Point in Non-overlapping Rectangles的一个简化版. (1)可以先依次对每个下标的权重累加存起来(相当于概率分布中的分布累积函数CDF,Cumulative Distribution Function). (2)从 [1, 总权重] 中随机取一个数n,根据这个数在多个累加权重之间寻找合适的位置,即可完成题目要求的随机采样. (…

一,布局 R绘图所占的区域,被分成两大部分,一是外围边距,一是绘图区域. 外围边距可使用par()函数中的oma来进行设置.比如oma=c(4,3,2,1),就是指外围边距分别为下边距:4行,左边距3行,上边距2行,右边距1行.很明显这个设置顺序是从x轴开始顺时针方向.这里的行是指可以显示1行普通字体.所以当我们使用mtext中的line参数时,设置的大小就应该是[0,行数)的开区间.当我们使用mtext在外围边距上书写内容时,设置mtext中的outer=TRUE即可. 绘图区域可使用par(…

2000年台湾大专题...英语阅读输入输出专场..我只能说很强势.. M. Frequent Subsets Problem The frequent subset problem is defined as follows. Suppose UU={1, 2,\ldots…,N} is the universe, and S_{1}S​1​​, S_{2}S​2​​,\ldots…,S_{M}S​M​​ are MM sets over UU. Given a positive constan…

02Train Seats Reservation 问答 只看题面 33.87% 1000ms 131072K You are given a list of train stations, say from the station 11 to the station 100100. The passengers can order several tickets from one station to another before the train leaves the station on…

B. Train Seats Reservation You are given a list of train stations, say from the station 1 to the station 100. The passengers can order several tickets from one station to another before the train leaves the station one. We will issue one train from t…

Given a list of non-overlapping axis-aligned rectangles rects, write a function pick which randomly and uniformily picks an integer point in the space covered by the rectangles. Note: An integer point is a point that has integer coordinates. A point …

Given a list of non-overlapping axis-aligned rectangles rects, write a function pick which randomly and uniformily picks an integer point in the space covered by the rectangles. Note: An integer point is a point that has integer coordinates. A point …

[384]Shuffle an Array(2019年3月12日) Shuffle a set of numbers without duplicates. 实现一个类,里面有两个 api,structure 如下: class Solution { public: Solution(vector<int> nums) { } /** Resets the array to its original configuration and return it. */ vector<int&g…

Counting rectangles By counting carefully it can be seen that a rectangular grid measuring 3 by 2 contains eighteen rectangles: Although there exists no rectangular grid that contains exactly two million rectangles, find the area of the grid with the…

Given an array w of positive integers, where w[i] describes the weight of index i, write a function pickIndex which randomly picks an index in proportion to its weight. Note: 1 <= w.length <= 10000 1 <= w[i] <= 10^5 pickIndex will be called at…

You are given the number of rows n_rows and number of columns n_cols of a 2D binary matrix where all values are initially 0. Write a function flip which chooses a 0 value uniformly at random, changes it to 1, and then returns the position [row.id, co…

Packing RectanglesIOI 95 The six basic layouts of four rectangles Four rectangles are given. Find the smallest enclosing (new) rectangle into which these four may be fitted without overlapping. By smallest rectangle, we mean the one with the smallest…

先让大家来看一幅图,这幅图是V8引擎4.7版本和4.9版本Math.Random()函数的值的分布图,我可以这么理解 .从下图中,也许你会认为这是个二维码?其实这幅图告诉我们一个道理,第二张图的点的分布更加的密集,也就是说Math.Random()函数能表示的数字更多了,大家在.NET中肯定也用过GUID吧,至于GUID为什么会永不重复,大家有没有想过呢? 还是让我们先来看看官方怎么解释Math.Random()吧,它是返回了一个正数,这个正数介于0~1之间,以伪随机的方式在这个范围内波动.Ma…

Math.random() 日期时间函数(需要用变量调用):var b = new Date(); //获取当前时间b.getTime() //获取时间戳b.getFullYear() //获取年份b.getMonth()+1; //获取月份b.getDate() //获取天b.getHours() //获取小时b.getMinutes() //获取分钟b.getSeconds() //获取秒数b.getDay() //获取星期几b.getMilliseconds() //获取毫秒 数学函数(用…

.Net中我们通常使用Random类生成随机数,在一些场景下,我却发现Random生成的随机数并不可靠,在下面的例子中我们通过循环随机生成10个随机数: ; i < ; i++) { Random random1 = new Random(); Console.WriteLine(random1.Next()); } 测试生成随时基本都是相同的结果: 很显然上面的结果是不靠谱的,为什么会这样呢,因为微软的Random类,发现在C#中生成随机数使用的算法是线性同余法,这种算法生成的不是绝对随机,而…

需求 Random rd=new Random(); 需要十以内的随机数  (0---10) System.out.println((int)((rd.nextDouble()*100)/10)); System.out.println(rd.nextInt(10)); 需要5-10之间的数(包括5和10) system.out.println( rd.nextDouble()*n+m;) n:6 m:5 总结公式 n+m=max+1   max=10 n=mix             mix…

Python写红包的原理流程 首先来说说要用到的知识点,第一个要说的是扩展包random,random模块一般用来生成一个随机数 今天要用到ramdom中unifrom的方法用于生成一个指定范围的随机浮点数通过下面的图简单看下: 这里就打印了一个值范围是在10~20之间的浮点数. 在来说说lambda表达式是匿名函数,是函数的另一种表达方式,以下清晰了介绍了使用效果: t函数有3个值,返回3个数之和,f是lambda表达式,作用同样是返回三个数只和,def 类似 lambda,t类似f, (x,…

Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array. Note: The array size can be very large. Solution that uses too much extra sp…

Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being chosen. Follow up: What if the linked list is extremely large and its length is unknown to you? Could you solve this effi…

A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy of the list. 这道链表的深度拷贝题的难点就在于如何处理随机指针的问题,由于每一个节点都有一个随机指针,这个指针可以为空,也可以指向链表的任意一个节点,如果我们在每生成一个新节点给其随机指…

<?php function random($min = 0, $max = 1) {     return $min + mt_rand()/mt_getrandmax()*($max-$min); } var_dump(random()); // 打印结果 float 0.79857454579257 ?>…