### Ten days of statistics (2) - Quatiles, Standard Deviation

Let's learn basic statistics in 10 days ### Ten days of statistics (1) - Mean, Median, Mode

Let's learn basic statistics in 10 days ### Binary Indexed Tree (Fenwick Tree)

A Fenwick tree or binary indexed tree (BIT) is a data structure that can efficiently update elements and calculate prefix sums in a table of numbers ### Collection of bit mask operation

I have collected a few popular and useful bit operations ### Modular Inverse

In arithmetic, a modular multiplicative inverse of an integer a is an integer x such that the product a*x = 1 with respect to the modulus m