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[LeetCode] Random Pick with Weight 根据权重随机取点

时间:2018-10-14 00:23:46      阅读:212      评论:0      收藏:0      [点我收藏+]

标签:pos   app   xpl   etc   fun   tco   nts   null   权重   

 

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. 1 <= w.length <= 10000
  2. 1 <= w[i] <= 10^5
  3. pickIndex will be called at most 10000 times.

Example 1:

Input: 
["Solution","pickIndex"]
[[[1]],[]]
Output: [null,0]

Example 2:

Input: 
["Solution","pickIndex","pickIndex","pickIndex","pickIndex","pickIndex"]
[[[1,3]],[],[],[],[],[]]
Output: [null,0,1,1,1,0]

Explanation of Input Syntax:

The input is two lists: the subroutines called and their arguments. Solution‘s constructor has one argument, the array wpickIndex has no arguments. Arguments are always wrapped with a list, even if there aren‘t any.

 

s

 

[LeetCode] Random Pick with Weight 根据权重随机取点

标签:pos   app   xpl   etc   fun   tco   nts   null   权重   

原文地址:https://www.cnblogs.com/grandyang/p/9784690.html

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