Useless Flights Useless Flights
Simple+
RU English

- Chief, we have a new flight schedule. It just require your signature and we are ready to launch.

- Wow, so many planes! I’d like to make sure that we really need so many of them.

- Of course.

- Let’s check!

This task is a continuation of the “Cheapest Flights” mission.

Here you have a flight schedule by which you need to find out whether all flights are really necessary.

For example: If from the point A to point C you can fly directly for $ 100, but you can also go through the point B (from A to B, and then from B to C) for $ 90, then connection A – C isn’t really needed. But if the price from A to C is $ 90 or less, then this connection remains on the schedule.

Input: An array of all possible connections. Each element in the array is also an array of 3 elements: the first city, second city and flight price.

Output: An array of the unnecessary flight indices.

Example:

useless_flight([['A', 'B', 50],
  ['B', 'C', 40],
  ['A', 'C', 100]]) == [2]
useless_flight([['A', 'B', 50],
  ['B', 'C', 40],
  ['A', 'C', 90]]) == []
Settings
Code:
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=

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checkio sync

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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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