How to Shuffle or Randomize a List in Java

In this post, we will discuss how to shuffle or randomize a List in Java using Fisher–Yates shuffle algorithm and shuffle() method provided by the Collections class.

Find odd occurring element in an array in single traversal

Given an array of integers, duplicates are present in it in such a way that all duplicates appear even number of times except one which appears odd number of times. Find that odd appearing element in linear time and without using any extra memory.

Quickselect Algorithm

Quickselect is a selection algorithm to find the kth smallest element in an unordered list. It is closely related to the quicksort sorting algorithm.

Longest Decreasing Subsequence Problem

The longest decreasing subsequence problem is to find a subsequence of a given sequence in which the subsequence’s elements are in sorted order, highest to lowest, and in which the subsequence is as long as possible.

Cryptography | 3-DES implementation in C

In cryptography, Triple DES (3DES) is a symmetric-key block cipher, which applies the Data Encryption Standard (DES) cipher algorithm three times to each data block.