GOST 28147-89 is a standard symmetric encryption based on a Feistel network. Structure of the algorithm consists of three levels: encryption mode
Continue ReadingC+: Mandelbrot Set
Generate and draw the Mandelbrot set. Note that there are many algorithms to draw Mandelbrot set and there are many functions which generate it.
Continue ReadingC++: Matrix Multiplication
Multiply two matrices together. They can be of any dimensions, so long as the number of columns of the first matrix is equal to the number of rows of
Continue ReadingC++: Abstract Type
Abstract type is a type without instances or without definition. For example in object-oriented programming using some languages, abstract types ca
Continue ReadingC++: Arithmetic Evaluation
Create a program which parses and evaluates arithmetic expressions. Requirements An abstract-syntax tree (AST) for the expression must
Continue ReadingC++: Why is one loop so much slower than two loops?
Suppose a1, b1, c1, and d1 point to heap memory and my numerical code has the following core loop. const int n=100000 for(int j=0;j<n;j++){
Continue ReadingC++ Binary Search Trees
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Continue ReadingC++: Modular Inverse
From Wikipedia: In modular arithmetic, the modular multiplicative inverse of an integer a modulo m is an integer x such that
Continue ReadingC++: Least Common Multiple
Compute the least common multiple of two integers. Given m and n, the least common multiple is the smallest positive integer that has both m and n
Continue ReadingC++: Empty Directory
Starting with a path to some directory, determine whether the directory is empty. An empty directory contains no files nor subdirectories. With Uni
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