freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-178-step-numbers.english.md

id, challengeType, title, forumTopicId

id	challengeType	title	forumTopicId
5900f41e1000cf542c50ff31	5	Problem 178: Step Numbers	301813

Description

Consider the number 45656. It can be seen that each pair of consecutive digits of 45656 has a difference of one. A number for which every pair of consecutive digits has a difference of one is called a step number. A pandigital number contains every decimal digit from 0 to 9 at least once.

How many pandigital step numbers less than 1040 are there?

Instructions

Tests

tests:
  - text: <code>euler178()</code> should return 126461847755.
    testString: assert.strictEqual(euler178(), 126461847755);

Challenge Seed

function euler178() {
  // Good luck!
  return true;
}

euler178();

Solution

// solution required