Mountain Scape Mountain Scape
The mission is in Blocked Mode. Access to the solutions is blocked for a day or two (even after you share your own), until we'll have enough solutions for you to check. All users who've solved the mission will get the notifications about their opening.

You are given the coordinates of the tops of the triangles as input values.

  • The slope angle is 45 degrees.
  • The base is always on the x-axis.
You must return the total area of all triangles. But count the overlapping areas only once.


  • The sum of the X and Y coordinates is always even. (e.g. (1, 3) (0, 2) ...)


mountain_scape([(1, 1), (4, 2), (7, 3)]) == 13
mountain_scape([(0, 2), (5, 3), (7, 5)]) == 29
mountain_scape([(1, 3), (5, 3), (5, 5), (8, 4)]) == 37

Input: A list of a tuple of two integers.

Output: An integer.


  • 0 ≤ x ≤ 100
  • 1 ≤ y ≤ 50
  • (x+y) % 2 == 0
  • 1 ≤ len(tops) ≤ 50

CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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