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  1. n = int(input())
  2. a = [int(input()) for x in range(n)]
  3. d = a[1] - a[0]
  4. print(d if all(x==y for x,y in zip(a, range(a[0], a[0] + d*n, d))) else 0)
Success #stdin #stdout 0.02s 9344KB
comments (?)
stdin
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5
6
3
0
-3
-6
stdout
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-3
https://ideone.com/hMi1Cs
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
public

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