Description

This numerical puzzle originates from the Turkish Intelligence Foundation sent to Will Shortz by Turkish puzzler Metin Orsel.

No crossing digits - Valid	Crossing digits - Valid	Reusing digits - Invalid
125 + 478 = 690 (false)	152 + 478 = 690 (false)	125 + 485 = 690 (Invalid)

How it works

1. First you start with a any digit on a telephone keypad.
2. Then you move to another digit adjacent from the previous digit either: horizontally, vertically or diagonally.
3. Continue the process until you have 9-digits total.
4. When you have collected your 9-digits the number formed from the first 3-digits plus the second 3-digits will equal the last 3-digits.

Requirements

• You may not use the same digit more than once.
• You may only use digits adjacent to each other.

Extra

Optional: To make things more difficult check to make sure adjacent digits do not cross paths.

Projects

This repository contains the solution to the phonepad problem in 2-languages: C++ and Typescript. To figure out how to build and run the projects continue reading below. I highly recommend you try to solve this problem yourself first.

C++

This project assumes cmake and make are on your PATH variable.

1. Open a command/terminal window in the project root directory.
2. enter cd .cmake; cmake .; make

Typescript

This project assumes you have Node.js, NPM, and Gulp installed globally.

1. Open a command/terminal window in the project root directory.
2. enter npm install; gulp start