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2021-02-06 04:42:36 +00:00
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curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-178-step-numbers.md
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---
id: 5900f41e1000cf542c50ff31
title: 问题178：步骤编号
title: 'Problem 178: Step Numbers'
challengeType: 5
videoUrl: ''
forumTopicId: 301813
dashedName: problem-178-step-numbers
---
# --description--
考虑数字45656.可以看出，45656的每对连续数字的差值为1。每对连续数字的差值为1的数字称为步数。 pandigital数字包含从0到9的每个十进制数字至少一次。
Consider the number 45656.
有多少pandigital步数小于1040？
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?
# --hints--
`euler178()`应该返回126461847755。
`euler178()` should return 126461847755.
```js
assert.strictEqual(euler178(), 126461847755);