# How does the Tomohiko Sakamotos algorithm work

This link acts as a recruiting tool for google. The Doomsday Method is a simple method of determining the day of the week of a given date that can be performed using mental arithmetic operations. Enter year (1900-1999): 1993 Enter month (1-12): 3 Enter day: 29 3/29/1993 was on a Monday. 4/4, 6/6, 8/8, 10/10 and 12/12 always fall on the same day of the week (Doomsday) in any year. Do you ... If you need to floor divide and get the remainder use divmod. There are actually some interesting ideas which can be talked about. So, are you ready? Google foobar is an interesting challenge. Zeller's Algorithm can be used to determine the day of the week for any date in the past, present or future, for any dates between 1582 and 4902. We, however, do not have weights on our graph, so we may use something like Micali -Vazirani (1980 Data fields with corresponding data belong to a class and its objects. The key step is finding the year doomsday (YDD) - the weekdays are counted modulo 7, Sunday = 0, Monday = 1, etc. improved the computational algorithm, and applied the model to data on microcapsules. John Conway discovered the Doomsday Rule. In particular, Zeller's congruence and the Doomsday algorithm make heavy use of modulo-7 arithmetic. The main difference is… years_doomsday would help move some of the hard to understand information to be self-contained.), that is: The modeling of the real world is done by objects, grouped in classes. The Java version was done first, and then Python one follows the same algorithm, just with the Python syntax. In particular, Zeller's congruence and the doomsday algorithm make heavy use of modulo-7 arithmetic. It was developed by the British mathematician John Horton Conway around 1970. All text is available under the terms of the GNU Free Documentation License. こ の 記事 は, ウ ィ キ ペ デ ィ ア の 食 事 す る 哲学 者 の 問題 (改 訂 履 歴) の 記事 を 複製, 再配 布 し た も の に あ た り, GNU Free Documentation License と い う ラ イ セ ン ス の 下 で提供 さ れ て い ま す。 $ java Doomsday Welcome to the Doomsday Calculator! Although there are plenty of methods to solve this question but one of the least known and most powerful method is Tomohiko Sakamoto's algorithm. Let's see how Tomohiko Sakamoto’s used the Doomsday Algorithm to determine the day of the week. If you memorize the phrase "I went to my nine-to-five job at the seven-eleven," you can also remember easily that 9/5, 7/11, 5/9 and 11/7 also fall on Doomsday. Solving Google Foobar and hacking it along the way Recently I learned about the existence of what is known as Google Foobar also known as “Google secret recruiting program” or “How much bunnies can you rescue before wanting to kill someone” and being the stubborn me that I am, I decided to force my way in and try the challenges!日 付 か ら 曜 日 を 求 め る 暗算 （Conway の Doomsday ア ル ゴ リ ズ ム） の 練習 を し て お り 、 そ そ の 答 え 合 わ せ に 使 わ せ ご も ご 」っ っ /03 / 03の 方 の 投稿 で 気 に な っ た の で 、 お 節 介 で す が 、 書 書 き ま す。… Yes, that Lewis Carroll. To use this algorithm, input your date of birth, and then boom the day of the week in which you were born on appears. The Doomsday algorithm for mental calculation was devised by John Conway, yes, that John Conway in 1973 based on inspiration from Lewis Carroll. Algorithms need not be boring or hard to use. I'll make a JavaScript app that can find the weekday for and date in history and display the steps. Recently, when my friend was browsing on the internet and searching for some JavaScript related questions he was posted with a link to the foobar challenge by google. In this article, I want to share with you how I solved the problems in real-time. He We'll reviews some ways to make code programming languages enable you to describe […] In this part I continue my JavaScript Tutorial and cover the Doomsday Algorithm. Doomsday Algorithm A. Google Foobar Ion Relabeling Solution. Java is object-oriented (see also script “Java” II: p. 1 ff. The purpose of this article is to educate you --- and to have some fun. Home Calculators Doomsday Calculator - Calculate the Weekday of Any Date in Your Head This calculator gives a quick lesson on how to calculate the weekday of any given date without the help of calculators, computers, or calendars is using the doomsday algorithm. In fact, algorithms surround you in many ways that you might not have thought about, and you use them every day to perform important tasks. GitHub Gist: instantly share code, notes, and snippets. Modulus operator java The Remainder or Modulus Operator in Java, Java has one important arithmetical operator you may not be familiar with,%, also known as the modulus or remainder operator. The Blossom algorithm is the most common algorithm for maximum matching, as it supports weights, and runs in \ (O (V ^ 2 E) \). Invited by my friend, I spent some time to complete More generally, modular arithmetic al so has application in disciplines such as law (see e.g., apportionment), economics, (see e.g., game theory) and other areas of the social sciences, where proportional division and allocation of resources plays a central part of the analysis. Used in Python 2.3 and up, and Java SE 7. This Google foobar site allows access to questions only for people with an invite. Liu et al. Project - Doomsday Algorithm 6 - Application and Implementation Lesson Six focuses on how to make your programs more elegant, functional, and interoperable with other programs. Insertion sorts Insertion sort: determine where the current item belongs in the list of sorted ones, and insert it there Both use recursion to solve the problem. However, you need to be able to use algorithms without having to become a mathematician. Explanation Jan 1st 1 AD is a Monday in Gregorian calendar. The geometry is meshed with a mapping algorithm or an automatic free-meshing algorithm. Ion Relabeling Solution Acknowledgments This post on StackExchange Code Review is the basis for this algorithm. Based on an algorithm, it determines the minimum distance that one's fingers need to travel while touch-typing a typical English text. When advancing a century from a century you know the Doomsday for, go back two days, unless the new century is divisible by 400, in which case only go back 食 事 す る 哲学 者 の 問題 （し ょ ょ く じ す る て て が が く し ゃ の も ん だ い, Dining Philosophers problem) と は, 並列 処理 に 関 す る 問題 を 一般化 し た 例 で あ る. 古典 的 な マ ル チ プ ロ セ ス の 同期 (排 他 制 御) 問題 で あ り, 大学 レ ベ ル の 計算機 科学 課程 に は ほ ぼ 確 実 に 含 ま れ て い る。 Determine the "anchor day" for the century. 4 + 3 days, hence we know that February 1 will be 3 days following the day that was January 1. The algorithm has since been modified and simplified several times (for details, see the Wikipedia’s Doomsday Rule and elsewhere). Then the next minion ID will be n = 0999 and the algorithm iterates again: x = 9990, y = 0999 and z = 9990 - 0999 = 8991, and so on. I just got invited to perform Google's FooBar challenge. By using this mental trick developed by mathematician John H. 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