Index Power Index Power
Elementary
CS ES FR IT PL English DE EL FA JA PT-BR RU UK

You are given an array with positive numbers and a number N. You should find the N-th power of the element in the array with the index N. If N is outside of the array, then return -1. Don't forget that the first element has the index 0.

Let's look at a few examples:
- array = [1, 2, 3, 4] and N = 2, then the result is 3 2 == 9;
- array = [1, 2, 3] and N = 3, but N is outside of the array, so the result is -1.

Input: Two arguments. An array as a list of integers and a number as a integer.

Output: The result as an integer.

Example:

index_power([1, 2, 3, 4], 2) == 9
index_power([1, 3, 10, 100], 3) == 1000000
index_power([0, 1], 0) == 1
index_power([1, 2], 3) == -1
        

How it is used: This mission teaches you how to use basic arrays and indexes when combined with simple mathematics.

Precondition: 0 < len(array) ≤ 10
0 ≤ N
all(0 ≤ x ≤ 100 for x in array)

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=

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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