[Python] Checkio Solution 解答 – Index Power

Level:

Elementary

Problem:

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 3² == 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.

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

Source: https://py.checkio.org

My Solution:

Comment:

Again, it’s like the exercise on Codecademy. =)