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Bangalore, India based company providing an online contest like environment aiming at providing recruitment assessment solutions. HackerRank: HackerRank offers programming problems in different domains of Computer Science. It also hosts annual Codesprints which help connect the coders and Silicon Valley startups. LeetCode
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet .
Their enterprise-side product, HackerRank for Work, is a subscription service that aims to help companies source, screen (CodePair), and hire engineers and other technical employees. [12] The product is intended to allow technical recruiters to use programming challenges to test candidates on their specific programming skills and better ...
As depicted, the Caesar cipher uses a substitution method much like the Aristocrat, however, instead of inserting a keyword into the ciphertext, you shift the ciphertext by three to the left. Coined in 1929 by a group of friends, a part of the American Cryptogram Association (ACA), the Aristocrat Cipher's name was a play on words intended to ...
Reconfiguration problems concern the connectivity of a state space of solutions to a combinatorial problem. For instance, testing whether two 4-colorings of a graph can be connected to each other by moves that change the color of one vertex at a time, maintaining at each step a valid 4-coloring, is PSPACE-complete, [ 8 ] even though the same ...
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"NP-complete problems are the most difficult known problems." Since NP-complete problems are in NP, their running time is at most exponential. However, some problems have been proven to require more time, for example Presburger arithmetic. Of some problems, it has even been proven that they can never be solved at all, for example the halting ...
Figure 1. Chaocipher disks in engaged starting position, ready for encryption/decryption. In Byrne's embodiment of Chaocipher, the system consists of two disks, referred to as the left and right disks, each having 26 equal-sized removable tabs around its periphery.