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…
［抄题］: 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 cal…
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…
import java.util.*; /** * 权重随机算法实现 * a b c d 对应权重范围 --- [0,1).[1,3).[3,6).[6,10) */ public class RandomSF { private static TreeMap<String, Integer> hm = new TreeMap<>(); public static void main(String[] args) throws Exception { TreeMap<Stri…
这就是数学中的 A m n 的选取. 共有 m!/n!种可能.. 同样举一个例子吧.. 从12345这五个数字中随机选取3个数字,要求选出来的这三个数字是有序,也就是说从12345中选出来的是123这三个数的话,那么就有 123,132,312,321,213,231 这六种可能.. 好了.废话不多说了,上程序,解释写在城市的注释里. //A53 //排序,12345找出所有的排序组合 public class Test7 { static char[] ch; static String…
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…
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. (…
作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/random-pick-with-weight/description/ 题目描述: Given an array w of positive integers, where w[i] describes the weight of index i, write a function pickIndex which…
原题链接在这里:https://leetcode.com/problems/random-pick-with-weight/ 题目: 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.l…
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. class Solution { Random random; int[] wSums; public Solution(int[] w) { this.rand…
镇场诗:---大梦谁觉,水月中建博客.百千磨难,才知世事无常.---今持佛语,技术无量愿学.愿尽所学,铸一良心博客.------------------------------------------ 1 code import random count=0 while True : num=random.randint(1,10) print(num) count=count+1 if count==10: break 2 show ------------------------------…
