随机数选择

Question

我有一个由随机数字和零组成的数组。我如何从中随机选择一个正数，并以一定的概率，比如说20%将其替换为另一个值，否则保持不变？

Answer 1

伪码

While Selected Number Is Not A Positive Number
      Select Random Index Between 0 and Size of Array - 1
      If Number at Index is Not Positive then continue to next iteration
      Else
      Generate Random Number Between 0 and 1
      If Random Number is less than 0.2 //20%
          Set Array[selected index] = some other value