July 11 (UPI) --With approval ratings falling and key reforms stalled in Congress, Colombian President Gustavo Petro enters the final year of his term facing a surge in illegal armed groups, growing ...

PREFIX SUM ARRAY: A prefix sum array is an array where each element at index i is the sum of all elements from the start (index 0) to index i of the original array.

Given an array containing both positive and negative numbers in random order. The task is to rearrange the array elements so that all negative numbers appear before all positive numbers.

Abstract: This paper presents a new efficient data structure, called “a BPA (Bitmap-Prefix-tree Array)” for discovering frequent closed itemset in large transaction database. Recently, most studies ...