C++ Skip | AtCoder

本文主要探讨了在AtCoder平台上使用C++解决编程问题的一些高级技巧和策略,包括如何优化代码效率,利用C++特性来简化解决问题的过程。

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Time Limit: 2 sec / Memory Limit: 1024 MB

Problem Statement

There are N cities on a number line. The i-th city is located at coordinate xi​.

Your objective is to visit all these cities at least once.

In order to do so, you will first set a positive integer D.

Then, you will depart from coordinate X and perform Move 1 and Move 2 below, as many times as you like:

  • Move 1: travel from coordinate y to coordinate y+D.
  • Move 2: travel from coordinate y to coordinate y−D.

Find the maximum value of D that enables you to visit all the cities.

Here, to visit a city is to travel to the coordinate where that city is located.

Constraints

  • All values in input are integers.
  • 1≤N≤10^5
  • 1≤X≤10^9
  • 1≤xi​≤10^9
  • xi​ are all different.
  • x1​,x2​,...,xN​!=X

In

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