ENG// A random number generator in a dynamic array with the ability to add, subtract ,multiply and divide the largest number and the smallest. RUS//Генератор случайных чисел в динамическом массиве с возможностью складывания, вычитания, умножения и деления наибольшего числа и наименьшего.

Permutation without repetition - written in Cython - for Numpy

An efficient random item sampler that ensures O(1) sampling complexity, and equal selection probability for all items across cycles. Each cycle ensures unique, non-repeating item selections, with each item sampled only once per cycle. Upon cycle completion, the sampler automatically refreshes, initiating a new cycle to repeat the process.

A weighted random item sampler (selector), where the probability of selecting an item is proportional to its weight, and every item is sampled exactly once (without repetition or replacement). The sampling method utilizes a binary-search optimization, making it suitable for performance-demanding applications where the set of items is large.