* fix: clean-up Project Euler 201-220 * fix: corrections from review Co-authored-by: Tom <20648924+moT01@users.noreply.github.com> Co-authored-by: Tom <20648924+moT01@users.noreply.github.com>
		
			
				
	
	
		
			47 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			47 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
 | |
| id: 5900f43f1000cf542c50ff51
 | |
| title: 'Problem 208: Robot Walks'
 | |
| challengeType: 5
 | |
| forumTopicId: 301849
 | |
| dashedName: problem-208-robot-walks
 | |
| ---
 | |
| 
 | |
| # --description--
 | |
| 
 | |
| A robot moves in a series of one-fifth circular arcs (72°), with a free choice of a clockwise or an anticlockwise arc for each step, but no turning on the spot.
 | |
| 
 | |
| One of 70932 possible closed paths of 25 arcs starting northward is
 | |
| 
 | |
| <img class="img-responsive center-block" alt="closed path of 25 arcs, starting northward" src="https://cdn.freecodecamp.org/curriculum/project-euler/robot-walks.gif" style="background-color: white; padding: 10px;">
 | |
| 
 | |
| Given that the robot starts facing North, how many journeys of 70 arcs in length can it take that return it, after the final arc, to its starting position?
 | |
| 
 | |
| **Note:** Any arc may be traversed multiple times.
 | |
| 
 | |
| # --hints--
 | |
| 
 | |
| `robotWalks()` should return `331951449665644800`.
 | |
| 
 | |
| ```js
 | |
| assert.strictEqual(robotWalks(), 331951449665644800);
 | |
| ```
 | |
| 
 | |
| # --seed--
 | |
| 
 | |
| ## --seed-contents--
 | |
| 
 | |
| ```js
 | |
| function robotWalks() {
 | |
| 
 | |
|   return true;
 | |
| }
 | |
| 
 | |
| robotWalks();
 | |
| ```
 | |
| 
 | |
| # --solutions--
 | |
| 
 | |
| ```js
 | |
| // solution required
 | |
| ```
 |