[leetcode]528. Random Pick with Weight按權重挑選索引
阿新 • • 發佈:2018-10-24
bsp nta con str NPU prop [1] ons cal has no arguments. Arguments are always wrapped with a list, even if there aren‘t any.
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 most10000
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 w
. pickIndex
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[leetcode]528. Random Pick with Weight按權重挑選索引